Medium Humanoid, Chaotic Evil
Armor Class 16
Hit Points 150 (30d10)
Speed 40 ft.
STR
8 (-1)
DEX
12 (+1)
CON
10 (+0)
INT
18 (+4)
WIS
20 (+5)
CHA
15 (+2)
Senses Truesight, Passive Perception 20
Languages All
Challenge 7 (2,900 XP)
Proficiency Bonus +3
Traits

Whispering, Screaming, Fading. The Catalyst is merely a shell for the greater power of the cosmos within. To stand near it is to withstand this force. At the start of each of its turns, anyone standing within ten feet of the Catalyst takes 10 (1d12 + 4) psychic damage.

Shell Cracking. If the Catalyst takes more than 30 damage in one turn of combat, it may take its reaction to use its Aberrant Scream, regardless of cooldown.

Actions

Multiattack. The Catalyst makes three attacks per turn. One with knife, one with its third arm, a scream if it is off cooldown.

Aberrant Scream (Recharge 5) .  The Catalyst arches its back and screams. Anyone within ten feet of it must make a DC 13 Wisdom Saving throw. On a failure, the target takes 10 (2d10) psychic damage and are frightened of the Catalyst for 1d4 turns. On a success, the target takes half as much damage and is not frightened.

Knife. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 8 (2d8) piercing damage and 3 (1d4 + 1) psychic damage. 

Aberrant Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target Hit: 12 (2d12) slashing damage.

Reactions

Madness. The Catalyst may use its reaction to afflict any target within 5 feet of it with short-term madness.

Description

No one quite knows what Father Ater looked like before he began his studies into the Enlightened One's true form. It doesn't really matter anymore. His studies have twisted him beyond recognition. His teeth are broken glass. A third arm juts from his back. In place of hair, long, many-jointed fingers cover his scalp. His face is lined with eyes, a common symptom of aberrant enlightenment. The monstrosity is merely a shell for cosmic energy. It must be felled, before the Great Old One's goals are met, and humanity drowns in darkness.

Cockytrice

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