# [Infected Elder Brain](Rules\Source\bestiary\aberration/infected-elder-brain-pabtso.md) *Source: Phandelver and Below: The Shattered Obelisk p. 159* The Far Realm has tainted the elder brain that fuels Illithinoch's mind flayers. ```statblock "name": "Infected Elder Brain (PaBTSO)" "size": "Large" "type": "aberration" "subtype": "mind flayer" "alignment": "Lawful Evil" "ac": !!int "10" "hp": !!int "189" "hit_dice": "18d10 + 90" "modifier": !!int "0" "stats": - !!int "15" - !!int "10" - !!int "20" - !!int "21" - !!int "19" - !!int "20" "speed": "5 ft., swim 10 ft." "saves": - "intelligence": !!int "9" - "wisdom": !!int "8" - "charisma": !!int "9" "skillsaves": - "name": "[Arcana](/Rules/Source/skills.md#Arcana)" "desc": "+9" - "name": "[Insight](/Rules/Source/skills.md#Insight)" "desc": "+12" "senses": "[blindsight](/Rules/Source/senses.md#Blindsight) 120 ft., passive Perception\ \ 14" "languages": "telepathy 1 mile; understands Common, Deep Speech, and Undercommon but\ \ can't speak" "cr": "11" "traits": - "desc": "The elder brain is aware of creatures within 1 mile of itself that have\ \ an Intelligence score of 4 or higher. It knows the distance and direction\ \ to each creature, as well as each one's Intelligence score, but can't sense\ \ anything else about it. A creature protected by a [mind blank](/Rules/Source/spells/mind-blank-xphb.md)\ \ spell, a [nondetection](/Rules/Source/spells/nondetection-xphb.md) spell,\ \ or similar magic can't be perceived in this manner." "name": "Creature Sense" - "desc": "The elder brain has advantage on saving throws against spells and other\ \ magical effects." "name": "Magic Resistance" - "desc": "The elder brain can use its telepathy to initiate and maintain telepathic\ \ conversations with up to ten creatures at a time. The elder brain can let\ \ those creatures telepathically hear each other while connected in this way." "name": "Telepathic Hub" "actions": - "desc": "The elder brain makes two Tentacle attacks." "name": "Multiattack" - "desc": "*Melee Weapon Attack:* +6 to hit, reach 30 ft., one target. *Hit:* 15\ \ (3d8 + 2) bludgeoning damage. If the target is a Huge or smaller creature,\ \ it has the [grappled](/Rules/Source/conditions.md#Grappled) condition (escape\ \ DC 14) and takes 9 (1d8 + 5) psychic damage at the start of each of its turns\ \ until the grapple ends. The elder brain can have up to four targets [grappled](/Rules/Source/conditions.md#Grappled)\ \ at a time." "name": "Tentacle" - "desc": "Creatures of the elder brain's choice within 60 feet of itself must succeed\ \ on a DC 17 Intelligence saving throw or take 32 (5d10 + 5) psychic damage\ \ and have the [stunned](/Rules/Source/conditions.md#Stunned) condition for\ \ 1 minute. A [stunned](/Rules/Source/conditions.md#Stunned) creature can repeat\ \ the saving throw at the end of each of its turns, ending the effect on itself\ \ on a success." "name": "Mind Blast (Recharge 5-6)" - "desc": "The elder brain casts one of the following spells, requiring no spell\ \ components and using Intelligence as the spellcasting ability (spell save\ \ DC 17):\n\n**At will:** [detect thoughts](/Rules/Source/spells/detect-thoughts-xphb.md),\ \ [levitate](/Rules/Source/spells/levitate-xphb.md)" "name": "Spellcasting (Psionics)" "bonus_actions": - "desc": "The elder brain targets one creature with the [incapacitated](/Rules/Source/conditions.md#Incapacitated)\ \ condition that the elder brain senses with its Creature Sense trait and establishes\ \ a psychic link with the target. Until the link ends, the elder brain can perceive\ \ everything the target senses. The target becomes aware that something is linked\ \ to its mind once it no longer has the [incapacitated](/Rules/Source/conditions.md#Incapacitated)\ \ condition, and the elder brain can terminate the link at any time (no action\ \ required). The target can use an action on its turn to attempt to break the\ \ link, doing so with a successful DC 17 Charisma check. If the target breaks\ \ the link this way, the target takes 10 (3d6) psychic damage. The link also\ \ ends if the target and the elder brain are more than 1 mile apart. The elder\ \ brain can form psychic links with up to ten creatures at a time." "name": "Psychic Link" "source": - "PaBTSO" "image": "/Rules/Source/bestiary/aberration/token/infected-elder-brain-pabtso.webp" ``` ^statblock