# Chapter 4: Wave Echo Cave *Source: Phandelver and Below: The Shattered Obelisk, p. 65* Fifteen miles east of Phandalin, Wave Echo Cave lies in the deep vales of the Sword Mountains. The rich mine of the Phandelver Pact was lost five hundred years ago during bandit attacks that devastated this area. In the centuries since, countless prospectors and adventurers have searched for the lost mine, but none succeeded until the three Rockseeker brothers found the entrance a month ago. Unfortunately, the dwarves didn't realize they were being followed by spies working for [Nezznar the Spider](/Rules/Source/bestiary/npc/nezznar-the-spider-pabtso.md), and the Rockseekers inadvertently led the villain to their prize. The Spider and his followers captured the two brothers who were guarding their find, then arranged for [Gundren Rockseeker](/Rules/Source/bestiary/npc/gundren-rockseeker-pabtso.md)'s ambush. After learning of the adventurers' involvement with Gundren, or of their exploits in and around Phandalin, the Spider issued orders for the characters to be dealt with. He then began exploring the depths of Wave Echo Cave. The drow is searching for the Forge of Spells, where the human mages of old Phandalin enchanted dwarven weapons and gnome gadgets. However, the Spider's exploration has been hindered by the dangerous monsters that lurk in Wave Echo Cave. The adventurers now have the chance to aid Gundren, find his brothers, and end the nefarious schemes of the Spider. Additionally, the abundance of powerful magic rumored to be hidden in the mines is a rich prize.  ## Running This Chapter This chapter kicks off once the characters venture into Wave Echo Cave, shown on map 4.1. The characters need not face significant dangers on their way to the cave. If you'd like to make the journey more interesting, consider rolling on the Triboar Trail Random Encounters table in chapter 3. Reroll a result of "Cragmaw goblin band" since the characters dealt with the goblins in that chapter. ### Character Advancement The characters should be 4th level when the chapter begins. The characters gain a level when they defeat [Nezznar the Spider](/Rules/Source/bestiary/npc/nezznar-the-spider-pabtso.md). ## Wave Echo Cave Once a thriving mine bustling with activity, Wave Echo Cave is now a dangerous place overrun with monsters. Whether the characters follow Gundren's map or receive directions to Wave Echo Cave from another source, their initial approach leads them to a narrow tunnel whose entrance is hidden within the Sword Mountain foothills (area W1). ### Wandering Monsters If the characters spend a long time in an area, you can check for wandering monsters by rolling a `dice:d20|noform|noparens|avg` (`d20`). On a roll of 17–20, an encounter takes place. Conversely, if the players seem restless, you can decide that an encounter occurs. Roll a `dice:d12|noform|noparens|avg` (`d12`) and consult the Wandering Monsters table to determine what threat the party meets. **Wandering Monsters** `dice: [](05-chapter-4-wave-echo-cave.md#^wandering-monsters)` | dice: d12 | Monsters | |-----------|----------| | 1–3 | `dice:2d4\|noform\|noparens\|avg` (`2d4`) [stirges](/Rules/Source/bestiary/monstrosity/stirge-xmm.md) | | 4–5 | `dice:1d4\|noform\|noparens\|avg` (`1d4`) [ghouls](/Rules/Source/bestiary/undead/ghoul-xmm.md) | | 6 | `dice:1d4\|noform\|noparens\|avg` (`1d4`) [gricks](/Rules/Source/bestiary/aberration/grick-xmm.md) | | 7–8 | `dice:1d4\|noform\|noparens\|avg` (`1d4`) [bugbears](/Rules/Source/bestiary/fey/bugbear-warrior-xmm.md) | | 9 | `dice:1d6\|noform\|noparens\|avg` (`1d6`) [skeletons](/Rules/Source/bestiary/undead/skeleton-xmm.md) | | 10 | `dice:1d6\|noform\|noparens\|avg` (`1d6`) [zombies](/Rules/Source/bestiary/undead/zombie-xmm.md) | | 11–12 | 1 [ochre jelly](/Rules/Source/bestiary/ooze/ochre-jelly-xmm.md) | ^wandering-monsters ### Wave Echo Cave Features The mine is cold, damp, and drafty. A noticeable breeze blows from area W1 toward area W16. Features of Wave Echo Cave are described below. #### Ceilings Tunnels are 10 feet high unless noted otherwise. Rooms have 20-foot-high ceilings, while natural caverns have 30-foot-high ceilings dotted with stalactites. #### Doors Unless noted otherwise, all doors are 6 feet tall, 4 feet wide, and made of 6-inch-thick cut slabs of stone fitted with iron handles and hinges. #### Walls The walls are hewn stone and are 3 feet thick. In a few areas (W14, W15, W19, and W20), they are dressed with well-fitted stone blocks. #### Floors All floors are smooth, natural stone. #### Light None. The boxed text assumes the characters have light sources or [darkvision](/Rules/Source/senses.md#Darkvision). #### Stalagmites Found in many of the natural caverns, these rock spires can provide cover. > [!note] > > Booming Waves > > The rhythmic thunder of pounding waves echoes throughout the mine—loud enough to make the stone underfoot vibrate. The waves come about two minutes apart, growing louder toward the northeast. > > Wave Echo Cave is nowhere near an ocean, but a water-filled cavern deep in the mine connects to an underground hot spring. The spring boils over continuously, producing a surge that slams into a narrow funnel and sounds like breaking surf. Describe this sound to players on occasion; it should pique their curiosity and lure them toward its source—and consequently draw them deeper into the mine. ^153 ### Cave Locations The following locations are keyed to map 4.1. > [!gallery] >  >  #### W1: Cave Entrance > [!readaloud] > > The entrance tunnel leads into a large natural cavern supported by a pillar of rock. In the western part of the cave, behind the pillar, are three bedrolls and a heap of ordinary supplies: sacks of flour, bags of salt, casks of salted meat, lanterns, flasks of lamp oil, pickaxes, shovels, and other gear. Amid the supplies, you see the body of a dwarf, dead for at least a week. > > The northeastern section of the cavern has collapsed, forming a ten-foot-wide, twenty-foot-deep pit. A sturdy hemp rope is tied around one of three stalagmites in the cavern and dangles into the pit. ^156 This was the Rockseekers' campsite. The dead dwarf is Tharden, Gundren's brother, who was killed by the Spider. Gundren's other brother, Nundro, is the Spider's prisoner in area W20. The dwarves' supplies are potentially useful but not particularly valuable. ##### Open Pit A tunnel at the bottom of the pit leads northwest toward area W2 and east toward area W3. ##### Goblin Body Slumped at the bottom of the pit is the body of a strange goblin with an elongated skull and green streaks on its skin. Any inspection of the body, which is dressed in filthy rags, reveals that it is not a Cragmaw goblin. The characters can't learn anything further now, but this is the body of a psionic goblin. This goblin was part of a small scouting group that stumbled across the mine. Finding the cave devoid of obelisk shards, the rest of the goblins left the area, leaving their companion's corpse behind. ##### Treasure Tharden wears a [cloak of protection](/Rules/Source/items/cloak-of-protection-xdmg.md), which the Spider overlooked in his haste to explore the rest of Wave Echo Cave. #### W2: Mine Tunnels  > [!readaloud] > > This area consists of numerous intersecting passages. The ceilings here are only six feet high, and several of the passages end in partially excavated rock faces. ^15b This maze of passages is an old section of Wave Echo Cave's original mine site. Lurking in one dead end is an [ochre jelly](/Rules/Source/bestiary/ooze/ochre-jelly-xmm.md). (You can decide the jelly's exact location.) When the party enters this section of the mine, the jelly begins stalking the group, instinctively waiting for an opportunity to attack a lone target. ##### Low Ceiling Because of the low ceiling in this area, Medium and larger creatures have disadvantage on melee weapon attack rolls except when fighting with light weapons. #### W3: Old Entrance > [!readaloud] > > Four tunnels intersect at this thirty-foot-high cavern. The walls are carved with simple reliefs showing dwarf and gnome miners at work. Nearly two dozen skeletons in rusted scraps of armor are scattered across the cavern floor. Some are dwarf skeletons, while others appear to be the remains of larger individuals. Half a dozen large, unlit brass lanterns stand in niches or on ledges around the cavern. ^15e The tunnel that runs south was the original entrance to Wave Echo Cave, but it was buried by the destruction that wracked the mines centuries ago. A pitched battle was fought here when bandits stormed the mines. The dead still lie where they fell. Six [stirges](/Rules/Source/bestiary/monstrosity/stirge-xmm.md) cling to the ceiling. The monsters find scant living prey in the mines and are ravenous. Since the characters are probably looking at the skeletons on the floor, the stirges are likely to get the drop on them. Any character who isn't watching the ceiling must succeed on a DC 14 Wisdom ([Perception](/Rules/Source/skills.md#Perception)) check to avoid being surprised. Characters who aren't surprised hear the stirges descending to attack. The lanterns and the carvings of miners at work were meant to welcome newcomers. #### W4: Old Guardroom > [!readaloud] > > Splintered stone benches and heaps of rubble from a partially collapsed ceiling fill this room. Amid ruined stone bunks and toppled weapon racks are eight corpses, including the rotting remains of two ogres. ^160 In the round after any living creature enters this chamber, the dead creatures clamber to their feet to attack. The two [ogre zombies](/Rules/Source/bestiary/undead/ogre-zombie-xmm.md) and six dwarf [zombies](/Rules/Source/bestiary/undead/zombie-xmm.md) fight until destroyed. #### W5: Assayers' Office > [!readaloud] > > This chamber was once an office or storeroom. A large stone counter bisects the room, set with three dusty balance scales made of iron. Cubbyholes carved into the north wall are stuffed with crumbling paper scraps. Several long-dead corpses sprawl across the floor. ^162 The centuries-old paper in the cubbyholes disintegrates if touched, but a character who reads Dwarvish can see faint markings on a few scraps, recording weigh-ins and disbursements. ##### Treasure Behind the counter sits a locked iron strongbox, requiring [thieves' tools](/Rules/Source/items/thieves-tools-xphb.md) and a successful DC 20 Dexterity check to open. This pay chest contains 600 cp, 180 sp, 90 ep, and 60 gp. #### W6: South Quarters This was a miners' barrack, where the skilled delvers working in Wave Echo Cave rested between shifts. Any character who listens at the partially open door hears faint crunching and splintering sounds with a successful DC 10 Wisdom ([Perception](/Rules/Source/skills.md#Perception)) check. > [!readaloud] > > Old stone bunks in orderly rows line the walls of this chamber, and a corroded iron brazier full of cold coals stands near the middle of the room. The bones of a half-dozen dwarves and larger bandits lie strewn about, still clad in scraps of armor. Three gray, hunched figures squat among the remains, pawing at the scraps and gnawing on the bones. ^165 Three [ghouls](/Rules/Source/bestiary/undead/ghoul-xmm.md) from the pack in area W9 are here, cracking and gnawing on the bones in the vain hope that some morsel of marrow remains. Eager for a fresh meal, the ghouls attack immediately. #### W7: Ruined Storeroom > [!readaloud] > > The eastern wall of this chamber has collapsed into a mass of rubble. To the north, a door stands ajar, leading to a good-sized storeroom. Dusty kegs and tuns are tucked neatly against the walls, all of them split open from age. ^167 It's not terribly comfortable, but the storeroom makes a secure resting place for the party. No monsters come this way. Moreover, the storeroom door is in good shape and can easily be blocked or barred from the inside. The contents of the barrels and tuns have long evaporated. #### W8: Fungi Cavern > [!readaloud] > > Dense carpets of weird fungi cover large sections of the floor in this cavern. The growth includes puffballs a foot across, weird shelf fungus growing on stalagmites, and large stalks and caps a good five feet tall. Some of the puffballs glow with an eerie green phosphorescence. ^169 Two violet fungi lurk here, one in the middle of the central fungi patch and one in the northern patch. They are hard to notice with all the other fungi around them. Each character can attempt a DC 15 Intelligence ([Nature](/Rules/Source/skills.md#Nature)) check to spot the violet fungi before moving within their reach. Characters can safely avoid the fungi by staying close to the southern and eastern walls. The green-glowing fungi are harmless, but they allow creatures to see the entire cavern without the aid of [darkvision](/Rules/Source/senses.md#Darkvision) or a light source. This cave has hindered the Spider's explorations. Nezznar suspects that the mine's magic workshops are nearby, but he's reluctant to risk facing the dangerous monsters here. #### W9: Great Cavern > [!readaloud] > > Steep escarpments divide this large cavern into three sections: high ledges at either end and a lower section in the middle. Carved stone stairs climb to the ledges. Two large tables stand in the middle section, along with a pair of old braziers. A smaller table stands on the eastern ledge. The skeletal remains of dozens of dead warriors attest to the fierceness of the fighting that took place long ago. ^16b The skeletal remains are inanimate. However, five [ghouls](/Rules/Source/bestiary/undead/ghoul-xmm.md) lurk in the shadows on the western ledge. Any character with a passive Wisdom ([Perception](/Rules/Source/skills.md#Perception)) score of 12 or more notices the ghouls. The ghouls notice any light or noise elsewhere in the cave and quickly bound down to attack. They are hungry and fight until destroyed. The escarpments are 10 feet high and require a successful DC 12 Strength ([Athletics](/Rules/Source/skills.md#Athletics)) check to climb. A creature that falls or is knocked from the top of a ledge takes `dice:1d6|noform|noparens|avg|text(3)` (`1d6`) bludgeoning damage and lands with the [prone](/Rules/Source/conditions.md#Prone) condition. #### W10: Dark Pool > [!readaloud] > > A still pool fills much of this cavern. The water is dark, revealing little of what might lie within. The shore of the pool consists of a thin layer of broken shells from strange, pale mussels. A fishy odor hangs in the air. > > A passage leads south from this area, and a set of steps climbs to the east. A sluggish stream flows from the cave to the northeast. ^16d Small fish swim along the edge of the water, but the pool is also inhabited by a larger creature: a [giant constrictor snake](/Rules/Source/bestiary/beast/giant-constrictor-snake-xmm.md). If the characters pass through this area, the snake slithers from the water and attacks the character at the back of the party. ##### Pool The pool is 20 feet deep in the middle. The stream to the northeast is 3 feet deep, and the ceiling of the passage is 2 to 3 feet above the water. Characters can easily wade through the stream to area W18. A character who explores the pool finds an old skeleton lying on the bottom, 10 feet from the shore and under 10 feet of water. These are the remains of a human wizard from old Phandalin who died defending the mines against bandit attackers. Several arrows remain lodged in the skeleton's ribcage. ##### Treasure The skeleton of the wizard wears three jeweled gold rings (150 gp each) and clutches a [wand of magic missiles](/Rules/Source/items/wand-of-magic-missiles-xdmg.md) in its bony fingers. #### W11: North Quarters The eastern door is barricaded from inside the room and requires a successful DC 20 Strength ([Athletics](/Rules/Source/skills.md#Athletics)) check to force open. A character who listens at either door and succeeds on a DC 10 Wisdom ([Perception](/Rules/Source/skills.md#Perception)) check hears gruff voices speaking Goblin and talking about how hungry they are. > [!readaloud] > > Old stone bunks line the walls of these quarters, which are lit and heated by a glowing iron brazier in the middle of the room. Six bugbears, including one who is larger than the others, lounge in the room, grumbling about their hunger. ^171 If the party enters from the west, add: > [!readaloud] > > Across the room is another door, this one blocked by a barricade made from the remains of a wooden table. ^172 Six [bugbears](/Rules/Source/bestiary/fey/bugbear-warrior-xmm.md) reside in this chamber. They are loyal minions of Nezznar. This room marks the front line in the Spider's assault on Wave Echo Cave, and the bugbears are here to prevent ghouls, zombies, or other Undead from troubling their leader in his lair (area W19). Like area W6, this was formerly a barrack for miners. The bugbears removed the corpses they found here and built the barricade. ##### Treasure The largest bugbear carries a [pouch](/Rules/Source/items/pouch-xphb.md) containing 15 cp, 13 ep, two agates worth 10 gp each, and a [potion of healing](/Rules/Source/items/potion-of-healing-xdmg.md). #### W12: Smelter Cavern > [!readaloud] > > A blast furnace and a mechanical bellows powered by a waterwheel dominate this large chamber. The furnace is cold and dark, but heaps of coal are piled nearby, along with carts full of unrefined ore. The waterwheel sits in a ten-foot-wide channel cut into the floor of the room, but the channel is dry. Passages exit to the west, south, and east. The empty channel exits to the north and east. > > More than a dozen withered corpses lie scattered around the room—individuals still wearing remnants of armor. Floating above them is a skull engulfed in green flame. ^175 Eight of the fallen dwarf warriors are [zombies](/Rules/Source/bestiary/undead/zombie-xmm.md). They rise and shuffle toward any living creatures that enter the room, but they don't pursue creatures outside this area for more than 1 round. In addition, a far more intelligent Undead creature guards this area: a [flameskull](/Rules/Source/bestiary/undead/flameskull-xmm.md). This creature was a servant of the dwarves' human wizard allies, and it continues to act on ancient instructions to prevent any intruders from passing through this area. This impressive chamber was the heart of the Wave Echo Cave mining operation. Here, the dwarves melted ore to refine ingots of pure silver, gold, and platinum. The dry channel is where the dwarves diverted the stream from area W18 to power the waterwheel here. The waterwheel operated the bellows that fed the furnace in the southeast corner of the room. The channel's bottom is 5 feet below floor level, and no ability check is required to scramble in or out of it. Characters in the channel can follow it from this room to the north or to the east, though the ceiling is only 5 feet high after the channel exits this room. Like the fungi cavern at area W8, this chamber poses a serious obstacle that prevents the Spider from reaching his objective: the Forge of Spells (area W15). Nezznar is still formulating a plan to get past the Undead guardians in this area. #### W13: Starry Cavern > [!readaloud] > > Glittering minerals in the ceiling of this large cavern catch any light and reflect it back to create the impression of a starry night sky. Dozens of skeletons—many crushed under fallen debris—are scattered across the floor. > > The cave is large enough to contain two freestanding structures. Each of these stone rooms is proportioned for human use, as opposed to the dwarf-sized doorways and furnishings elsewhere in the mines. Both structures have battered and blackened masonry walls, their double doors cracked and scorched. > > The cavern is divided by an escarpment, into which a flight of stairs has been cut. Passages lead from this area to the north, south, and west. ^177 The structural damage and the skeletal remains in this area are evidence of the destructive spell battle fought here centuries ago when the bandits and their mercenary wizards stormed the mines. The damaged rooms are described in areas W14 and W15. The skeletons are inanimate and pose no danger. The minerals in the ceiling are pretty, but they are neither magic nor valuable. Any character proficient in the [Arcana](/Rules/Source/skills.md#Arcana) skill can sense a subtle aura of magic in this cavern. (A [detect magic](/Rules/Source/spells/detect-magic-xphb.md) spell reveals the same.) The aura becomes stronger as one approaches the northernmost room (area W15). #### W14: Wizards' Quarters The double door leading into this area is cracked, the iron hinges partially melted. Wrenching or smashing open the door requires a successful DC 15 Strength ([Athletics](/Rules/Source/skills.md#Athletics)) check.  > [!readaloud] > > Dust, ash, walls blackened by fire, and heaps of debris beneath the sagging ceiling show that this room was damaged by a destructive blast. The furnishings—tables, chairs, bookshelves, beds—are charred or splintered. A scorched iron chest stands near the foot of one of the beds. The adjacent closet on the south wall is full of rubble. ^179 This room contains the restless spirit of the last wizard to die here, Mormesk the [wraith](/Rules/Source/bestiary/undead/wraith-xmm.md). Mormesk was a powerful mage until he met his end in the spell battle at the climax of the bandit attack. Centuries of anger have poisoned his soul, transforming him into a hate-filled apparition. Mormesk leads the Undead that haunt Wave Echo Cave. The wraith spends his time here because the treasure he had amassed in life lies in the scorched chest. No longer corporeal, he cannot touch or possess the wealth he enjoyed in life. This room served as a guesthouse for visiting wizards working in the Forge of Spells (area W15), most of whom were humans from nearby cities. The furnishings are all sized for humans. ##### Treasure The scorched chest is unlocked and contains 1,100 cp, 160 sp, 100 ep, five malachites each worth 10 gp, and a wooden pipe adorned with platinum filigree worth 150 gp. #### W15: Forge of Spells  The wizards who allied with the dwarves and gnomes of the Phandelver Pact channeled the latent magic of these caverns to enchant well-made dwarven arms and gnome gadgets. The northernmost door is scorched and cracked, its iron hinges partially melted; forcing it open requires a successful DC 15 Strength ([Athletics](/Rules/Source/skills.md#Athletics)) check. The double door is just as damaged but stands slightly ajar. > [!readaloud] > > This large workshop was badly damaged by the ancient spell battle that laid waste to the mine. Worktables taking up two corners of the room are scorched, and the plaster has burned off the masonry walls. In the middle of the room, a stone pedestal holds a small brazier in which an eerie green flame dances and crackles. The brazier and its pedestal appear to have been untouched by the forces that destroyed this area. > > Behind the brazier of green flames floats a spherical creature measuring roughly four feet in diameter. Four eyestalks protrude from its central mass, two on each side. In the center of the body is a large eye that stares at you. It greets you in a raspy voice you hear only in your head. ^17c The spherical monster that guards this room is a [spectator](/Rules/Source/bestiary/aberration/spectator-xmm.md) that speaks Common. One of the human wizards who worked in the Forge of Spells summoned the creature to guard the magic items created and stored here. The spectator was slated to serve for 101 years. When the mine was sacked, the bandits disturbed the delicate magic in the area, eroding the spectator's grip on reality. It believes the mine is still in use, ignoring all evidence to the contrary. The wraith (area W14) wants to eliminate the spectator, but so far, the creature has easily handled the assaults of Mormesk's zombies and ghouls while seeing nothing strange about Undead roaming the mine. With a successful DC 15 Charisma ([Deception](/Rules/Source/skills.md#Deception)) check, a character can convince the spectator that one or more party members are wizards or dwarves who work for the owners of Wave Echo Cave, sent to terminate the spectator's employment (thereby releasing it from its obligations). If the deception succeeds, the spectator disappears and returns to its home dimension. If the party attempts to remove anything from this area, the spectator attacks. ##### Brazier of Green Flame A successful DC 15 Intelligence ([Arcana](/Rules/Source/skills.md#Arcana)) check identifies the brazier as the source of the magic that suffuses the surrounding caverns. This magic has waned over the years and can no longer be harnessed to permanently enchant magic items. However, any nonmagical weapon or suit of armor bathed in the green flame for at least 1 minute becomes a [+1 weapon](/Rules/Source/items/1-weapon-xdmg.md) or a suit of [+1 armor](/Rules/Source/items/1-armor-xdmg.md), respectively, for `dice:1d12|noform|noparens|avg` (`1d12`) hours. Removing the brazier from the Forge of Spells douses the green flame and forever deprives the brazier of its magical power. ##### Northern Room This small room was a separate workspace where items being prepared for enchantment were polished, painted, lacquered, and otherwise finished. Like the main workshop, it is heavily damaged. ##### Treasure On the worktable in the southeast corner of the room are the items the spectator was charged to protect: a [+1 mace](/Rules/Source/items/1-weapon-xdmg.md) and a [+1 breastplate](/Rules/Source/items/1-armor-xdmg.md). These magic items have some additional properties that are described below: - **Mace.** This weapon, known as [Lightbringer](/Rules/Source/items/lightbringer-pabtso.md), was made for a cleric of Lathander, the god of dawn. The head of the mace is shaped like a sunburst and is made of solid brass. The mace glows as bright as a torch when its wielder commands. While glowing, the mace deals an extra `dice:1d6|noform|noparens|avg` (`1d6`) radiant damage to Undead creatures. - **Breastplate.** This [breastplate](/Rules/Source/items/dragonguard-pabtso.md) has a gold dragon motif worked into its design. Created for a human hero of old Neverwinter named Tergon, it grants its wearer advantage on saving throws against the breath weapons of Dragons. #### W16: Booming Cavern > [!readaloud] > > A narrow ledge overlooks a large cavern that houses a surging, seething body of water. The rhythmic booming heard throughout the mines is louder here. At regular intervals, a fresh surge of water funnels into this chamber and slams against the wall just below the ledge. The echo suggests that this cave might be one arm of a much larger cavern to the northeast. ^181 The sound of pounding surf that gives Wave Echo Cave its name can be traced to this water-filled cavern. The ledge that hugs the south wall is 15 feet above water level. However, when water surges into the cave every 2 minutes, it raises the water level by 10 feet. After 1 minute, the water level returns to its normal depth of 20 feet. This flooded cave is home to a [giant octopus](/Rules/Source/bestiary/beast/giant-octopus-xmm.md) that is attracted to any light above the surface of the water. If a character lingers with a lantern, torch, or other light source, the octopus rises to the surface and attacks. Its tentacles are long enough to reach targets standing on the ledge, but creatures more than 5 feet from the edge are safe. The giant octopus pulls any creature it grapples into the water. A character who starts their turn in the water must succeed on a DC 10 Strength saving throw to remain afloat. On a failed save, the character is pulled underwater. ##### Northeast Cavern The larger cavern to the northeast is an underground lake several hundred yards across that offers access to several other passages and cave systems. The miners of the Phandelver Pact made preliminary explorations of those areas, but records of their excursions are long lost. The hot spring that produces the regular surge of water lies somewhere beyond. Characters who enter the water here discover it is warmer than would be expected for a subterranean lake. #### W17: Old Streambed > [!readaloud] > > This passageway is barely four feet high and is obstructed by rounded boulders and pebbles. It looks as though it might have been a streambed, though no water flows here now. ^184 The stream flowing from area W10 to area W18 used to continue through this low passage, eventually emptying into area W16. The dwarves diverted the stream into the channel leading to area W12 to drive the waterwheel in the smelter. The earthquakes that rocked Wave Echo Cave during the final spell battle of the bandit invasion collapsed the floor in area W18, diverting the stream once again. The old streambed remains a usable passage that circumvents the Undead in area W12, though the Spider has not yet discovered this. #### W18: Collapsed Cavern > [!readaloud] > > A wide rift fills the eastern half of this cavern. A stream pours from the west wall before tumbling into the rift and flowing to the north. Secured to iron stakes along on the western edge of the rift are several ropes leading to the chasm floor. A drow supervisor barks orders at two bugbears sifting through rubble while two other bugbears stand guard. ^186 Nezznar's lackeys occupy this cavern. The Spider's divinations suggest that some valuable treasure is hidden at the bottom of the rift that was created when this area was destroyed. Two of the four [bugbears](/Rules/Source/bestiary/fey/bugbear-warrior-xmm.md) in this area clear rock on the rift floor while the other two stand guard in the western half of the cavern, watching for any Undead incursions. A [doppelganger](/Rules/Source/bestiary/monstrosity/doppelganger-xmm.md) named Vhalak supervises the operation in the guise of a drow. If a fight breaks out in the main cavern, the two bugbears in the rift climb the ropes to join the fray. ##### Rift The rift is 20 feet deep. ##### Development If three or more bugbears are killed, the doppelganger tries to retreat to area W19 to warn the Spider that trouble is coming. ##### Treasure Nezznar's divinations are accurate. Buried in the shallow rubble at the bottom of the rift is the crushed skeleton of a dwarf wearing [gauntlets of ogre power](/Rules/Source/items/gauntlets-of-ogre-power-xdmg.md). The remains can be found with a successful DC 20 Wisdom ([Perception](/Rules/Source/skills.md#Perception)) check. Each character searching can attempt one check per hour. Characters who search for more than one hour might alert the creatures nearby of their presence, at your discretion. #### W19: Temple Of Dumathoin  Nezznar uses this room as his headquarters while he explores the mines and searches for the Forge of Spells. > [!readaloud] > > Six cracked and splintered marble pillars line the walls of this hall. A nine-foot-tall statue of a dwarf seated on a throne, a mighty stone warhammer across his lap, occupies the north end. Large emeralds gleam in his eyes. > > Dust and debris have been swept to one side of the floor. Half a dozen bedrolls and packs are neatly arranged around a rough-built firepit before the statue. A wooden table stands on the west side of the room between two pillars. ^18b If the room's occupants aren't aware of the characters as they enter, add the following: > [!readaloud] > > Two bugbears stand by the table, flanking a drow dressed in black leather armor and robes. The drow clutches a black staff with a carved spider at the top and frowns when he sees you. "It seems that I must deal with you myself. A pity it must end this way." ^18c [Nezznar the Spider](/Rules/Source/bestiary/npc/nezznar-the-spider-pabtso.md) is accompanied by two [bugbears](/Rules/Source/bestiary/fey/bugbear-warrior-xmm.md) who defend their leader to the death. If the [doppelganger](/Rules/Source/bestiary/monstrosity/doppelganger-xmm.md) from area W18 retreated to this area, it assumes the guise of [Nundro Rockseeker](/Rules/Source/bestiary/npc/nundro-rockseeker-pabtso.md) so that Nezznar can use the dwarf as leverage to force the party's surrender (although the Spider won't actually harm the doppelganger). See "Roleplaying Nezznar" for more information on the Spider. If they're expecting trouble, the bugbears hide behind pillars, and Nezznar casts [invisibility](/Rules/Source/spells/invisibility-xphb.md) on himself and stands near the table. Make a Dexterity ([Stealth](/Rules/Source/skills.md#Stealth)) check for the bugbears; the lowest roll is the DC of the Wisdom ([Perception](/Rules/Source/skills.md#Perception)) check the characters must make to avoid being surprised. ##### Statue The statue in the room depicts Dumathoin, the dwarven god of mining. Any character proficient in the [Religion](/Rules/Source/skills.md#Religion) skill recognizes the depiction. The statue is beautifully carved, and its emerald eyes appear to be worth 5,000 gp each. A character can climb the statue and pry loose a gem with a DC 10 Strength check. If either gem is removed, the character must succeed on a DC 12 Dexterity saving throw or the six pillars that line the walls crumble, triggering a ceiling collapse. Every creature in the room must make a DC 15 Dexterity saving throw. A creature takes `dice:2d10|noform|noparens|avg|text(11)` (`2d10`) bludgeoning damage from falling rubble on a failed save, or half as much on a successful one. Any creature still in the room 1 round later is buried and killed as the chamber fills with stone, at which point the area becomes impassible. ##### Table The table is strewn with notes and maps showing Nezznar's efforts at exploring the mine so far. There is also a sack of treasure amid the papers (see "Treasure" below). ##### Roleplaying Nezznar Even though he intends to kill the characters, Nezznar can't resist being curious about them. Given the chance, he quizzes the characters at length regarding their identities, allegiances, interests, and goals, filing it all in his memory in the hope that someday he will find a use for what he learns. Nezznar admits to being the Spider, and to using the Cragmaw goblins and the Redbrands to ensure that Wave Echo Cave remains his secret. He'll say or do anything to put the characters off guard, including promising to surrender or proposing cooperation against the monsters impeding his progress toward reaching the Forge of Spells. However, he betrays the characters as soon as he can. ##### Development The creatures in area W18 can hear sounds of combat in this room. If they haven't already been dealt with, they arrive after 3 rounds and act immediately after the bugbears in the initiative count. If the characters capture Nezznar and deliver him to the townmaster's hall in Phandalin, he is locked up until [Sildar Hallwinter](/Rules/Source/bestiary/npc/sildar-hallwinter-pabtso.md) or another representative of the Lords' Alliance can escort him to Neverwinter to face interrogation. The organization in Neverwinter is curious to learn everything Nezznar knows about Wave Echo Cave. Unless the characters post guards outside Nezznar's cell, Halia Thornton (see chapter 2) breaks him out of jail, smuggles him out of Phandalin, and delivers him into the custody of the leaders of the Zhentarim. What happens to Nezznar at that point is up to you. ##### Treasure Nezznar carries a [potion of healing](/Rules/Source/items/potion-of-healing-xdmg.md) and a [spider staff](/Rules/Source/items/spider-staff-pabtso.md). In addition, he carries an iron key with a head shaped like an anvil. This key unlocks the door to area W20. Nezznar's exploration of Wave Echo Cave has yielded some treasure, which he keeps in a black leather [sack](/Rules/Source/items/sack-xphb.md) on the wooden table. The sack contains 190 ep, 130 gp, 15 pp, nine small gemstones (10 gp each), and a dwarven ale mug made of hammered electrum (80 gp). #### W20: Priests' Quarters The door to this room is locked, requiring [thieves' tools](/Rules/Source/items/thieves-tools-xphb.md) and a successful DC 15 Dexterity check to open. Nezznar (area W19) carries the key. Unless the characters are being stealthy, any activity at the door attracts the attention of Nezznar and his allies in area W19, prompting the Spider to send his bugbears to investigate. > [!readaloud] > > Dusty draperies of red and gold adorn the walls of this room, which also contains a bed and brazier. A badly disheveled dwarf lies bound and [unconscious](/Rules/Source/conditions.md#Unconscious) on the cold stone floor. ^193 The figure lying on the floor is Nundro, a dwarf [commoner](/Rules/Source/bestiary/humanoid/commoner-xmm.md) and the last of the three Rockseeker brothers. Nezznar kept him alive because he thought the dwarf might know more about the mine than he admitted. The Spider has interrogated Nundro every day ever since capturing him. ##### Development Nundro is grateful if the heroes rescue him, and he offers to tag along for the duration of their stay in Wave Echo Cave. Nundro doesn't know any more about the layout of the cave than the characters already do. If the characters deal with Nezznar and the bugbears, this area serves as a safe place to rest before continuing their explorations of the mine. ## What's Next? Gundren and [Nundro Rockseeker](/Rules/Source/bestiary/npc/nundro-rockseeker-pabtso.md) take over administration of the new mine. For the adventurers' service to their family, they gladly award the party a 10 percent share of the mine's profits. It's up to you how much gold you give the players and how often. Consider giving the characters a sum of 255 gp (`dice:10d10+200|noform|noparens|avg` (`10d10 + 200`)) at the beginning of each chapter to represent this award. The heroes have now defeated the Spider and undone his plots, cleared Phandalin of the ruffians who threatened its people, and reclaimed the lost mine of Wave Echo Cave. If you aren't playing subsequent chapters of this adventure, no new plots need surface. If you are playing subsequent chapters, the characters likely want to escort Nundro home to Phandalin. They may also wish to follow up on disturbing evidence that strange goblins who aren't Cragmaws are threatening the area. No matter the characters' reasons, once they return to Phandalin, they'll find that these goblins have begun committing crimes in the town that hint at even more dangers to come.