Summon Lesser Demon. Once per long rest the cerebrilith may summon 4d6 dretchs (35%).
Spellcasting. The cerebrilith is a 9th level spellcaster. Its spellcasting ability is intelligence. The cerebrilith has following wizard spells prepared:
1st level (4 slots): Detect magic, Id Insinuation
2nd level (3 slots): Mind thrust, Detect thoughts
4th level (3 slots): Ego whip
5th level (2 slots): Dominate person
Preserve Brain. A cerebrilith can remove the brain of a recently deceased creature (no more than 24 hours dead) and insert it into its own braincase. While in the braincase, the brain is preserved as per a gentle repose spell, and the cerebrilith can use detect thoughts to read that creature’s thoughts and memories. This doesn’t expel a spell slot. A cerebrilith can preserve a number of brains at a time equal to its Constitution modifier (7 brains for a typical specimen).
Oozing Slime. Due to a slime secreting from its skin the cerebrilith has advantage against being grappled or restrained.
Psychic Infusion. 3/day a cerebrilith may infuse it’s claws and bite with psychic energy as a bonus action. This lasts for 3 minutes and deals an extra 1d8 psychic damage per successful attack.
Multi-attack. The cerebrilith can attack once with its bite and twice with its claws per turn.
Bite Attack. Melee Attack: +7to hit, reach 5 ft., 1 target. Hit: (2d8+6) piercing damage.
Claw Attack. Melee Attack: +7 to hit, reach 10ft., 1 target. Hit: (2d6+6) slashing damage.
Magical Darkness. Able to cast the darkness spell at will, creating a 60ft sphere of magical darkness.
Teleportation. Able to teleport itself and 50lb of material at will as per the teleport spell.
Description
This vaguely humanoid horror walks stooped on its knuckles, its body weighed down by its immense brain, which extends down its spinal column and is covered in a bladed exoskeleton. Its body oozes a thin slime.
A cerebrilith, or brain demon, is a fiend created from the soul of a chaotic evil psychic spellcaster. They are obsessed with power, both physical and mental, and tune their bodies and minds into killing machines in order to battle against outsiders and mortals alike. They rarely get along with demons other than their fellow cerebriliths, as they look down on creatures without psychic powers as their inferiors.
The braincases of a cerebrilith are not filled with their own brains, but instead those they have stolen from other creatures. A cerebrilith can scan the memories and thoughts of a stolen brain long after its owner has died, and cerebriliths hunt for particularly insightful or experienced victims in order to have the best “libraries”. In combat, a cerebrilith combines mental and physical attacks in a furious assault, focusing their attention on whoever they believe would make a fine addition to their collection.
A cerebrilith would stand ten feet tall if it ever stood upright, but their hunched postures keep them around 8 feet in height.
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