# [Leviathan](Rules\Source\bestiary\elemental/leviathan-mpmm.md) *Source: Mordenkainen Presents: Monsters of the Multiverse p. 171* A leviathan is an immense creature that acts as a force of nature, dragging ships down to the ocean's depths and washing away coastal settlements. When called forth, a leviathan arises from a large body of water and takes on the form of a gigantic serpent. Usually found only on the Elemental Plane of Water, a leviathan sometimes swims through a portal to another world, where tritons, sea elves, and other aquatic folk attempt to contain it. Nihilistic cults have also been known to perform arduous rituals to summon a leviathan to a world, with the aim of using the creature to destroy coastal communities. Those cultists often consider it a blessing to drown themselves in the elemental's waters. ```statblock "name": "Leviathan (MPMM)" "size": "Gargantuan" "type": "elemental" "alignment": "Typically Neutral" "ac": !!int "17" "hp": !!int "328" "hit_dice": "16d20 + 160" "modifier": !!int "7" "stats": - !!int "27" - !!int "24" - !!int "30" - !!int "2" - !!int "18" - !!int "17" "speed": "40 ft., swim 120 ft." "saves": - "wisdom": !!int "10" - "charisma": !!int "9" "damage_resistances": "bludgeoning, piercing, slashing from nonmagical attacks" "damage_immunities": "acid, poison" "condition_immunities": "[exhaustion](/Rules/Source/conditions.md#Exhaustion), [grappled](/Rules/Source/conditions.md#Grappled),\ \ [paralyzed](/Rules/Source/conditions.md#Paralyzed), [petrified](/Rules/Source/conditions.md#Petrified),\ \ [poisoned](/Rules/Source/conditions.md#Poisoned), [prone](/Rules/Source/conditions.md#Prone),\ \ [restrained](/Rules/Source/conditions.md#Restrained), [stunned](/Rules/Source/conditions.md#Stunned)" "senses": "[darkvision](/Rules/Source/senses.md#Darkvision) 60 ft., passive Perception\ \ 14" "languages": "" "cr": "20" "traits": - "desc": "If the leviathan fails a saving throw, it can choose to succeed instead." "name": "Legendary Resistance (3/Day)" - "desc": "If the leviathan takes 50 cold damage or more during a single turn, the\ \ leviathan partially freezes; until the end of its next turn, its speeds are\ \ reduced to 20 feet, and it makes attack rolls with disadvantage." "name": "Partial Freeze" - "desc": "The leviathan deals double damage to objects and structures." "name": "Siege Monster" - "desc": "The leviathan can enter a hostile creature's space and stop there. It\ \ can move through a space as narrow as 1 inch wide without squeezing." "name": "Water Form" "actions": - "desc": "The leviathan makes one Slam attack and one Tail attack." "name": "Multiattack" - "desc": "*Melee Weapon Attack:* +14 to hit, reach 20 ft., one target. *Hit:* 21\ \ (2d12 + 8) bludgeoning damage plus 13 (2d12) acid damage." "name": "Slam" - "desc": "*Melee Weapon Attack:* +14 to hit, reach 20 ft., one target. *Hit:* 19\ \ (2d10 + 8) bludgeoning damage plus 10 (3d6) acid damage." "name": "Tail" - "desc": "The leviathan magically creates a wave of water that extends from a point\ \ it can see within 120 feet of itself. The wave is up to 250 feet long, up\ \ to 250 feet tall, and up to 50 feet wide. Each creature in the wave must make\ \ a DC 24 Strength saving throw. On a failed save, a creature takes 45 (7d12)\ \ bludgeoning damage and is knocked [prone](/Rules/Source/conditions.md#Prone).\ \ On a successful save, a creature takes half as much damage and isn't knocked\ \ [prone](/Rules/Source/conditions.md#Prone). The water spreads out across the\ \ ground in all directions, extinguishing unprotected flames in its area and\ \ within 250 feet of it, and then it vanishes." "name": "Tidal Wave (Recharge 6)" "legendary_description": "Legendary Action Uses: 3. Immediately after another creature's\ \ turn, the leviathan can expend a use to take one of the following actions. The\ \ leviathan regains all expended uses at the start of each of its turns." "legendary_actions": - "desc": "The leviathan moves up to its speed." "name": "Move" - "desc": "The leviathan makes one Slam attack." "name": "Slam (Costs 2 Actions)" "source": - "MPMM" "image": "/Rules/Source/bestiary/elemental/token/leviathan-mpmm.webp" ``` ^statblock ## Environment coastal, underwater