Aberrant Cultist

The cultist casts one of the following spells, using Wisdom as the spellcasting ability (spell save DC 15):

At will: Detect Thoughts, Minor Illusion

The cultist casts Counterspell in response to that spell's trigger, using the same spellcasting ability as Spellcasting.

2/day: Counterspell

The cultist makes two Tentacle Lash attacks. It can replace any attack with a use of Mind Rot.

Melee Attack Roll: +7, reach 10 ft. Hit: 7 (1d6 + 4) Slashing damage plus 14 (4d6) Psychic damage. If the target is a Large or smaller creature, it has the Grappled condition (escape DC 14) from one of two tentacles, and it has the Restrained condition until the grapple ends.

Wisdom Saving Throw: DC 15, one creature the cultist can see within 90 feet. Failure: 27 (6d8) Psychic damage, and the target has the Poisoned condition until the start of the cultist's next turn. Success: Half damage only.