Keen Sight. The ygurr'thu has advantage on Wisdom (Perception) checks that rely on sight.

Uncanny Insight. The ygurr'thu has advantage on Wisdom (Insight) checks if it can observe a target for at least one minute.

Telepathy. The ygurr'thu can communicate (bidirectionally) with any creature within 60' that is capable of speaking a language.

Adherent Mobility. The ygurr'thu can move on walls and ceilings with sticky ease.

Spellcasting. The ygurr'thu has spellcasting ability using its Intelligence (spell save DC 15, +6 to hit with spell attacks). The ygurr'thu can cast the following spells:

Cantrips (at will): friends, mage hand, mending, message

1st level (4 slots): charm person, command, silvery barbs

2nd level (3 slots): detect thoughts, suggestion, tasha's mind whip

3rd level (3 slots): fear, hypnotic pattern, nondetection

4th level (2 slots): confusion, stoneskin

5th level (1 slot): dream

Multiattack. The ygurr'thu makes two tentacle attacks.

Tentacle. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) bludgeoning damage , and the target is grappled and incapacitated (escape DC 14).

Mind Invasion. The ygurr'thu targets one creature it can see within 60 feet. The target must make an Intelligence save against the ygurr'thu's Wisdom (Insight) check. If the ygurr'thu wins, it learns one fact or secret about the target.

Abandon Hope. The ygurr'thu targets one creature it can see within 30 feet. The target must succeed on a DC 15 Intelligence saving throw against this magic or take 10 (3d6) psychic damage. The ygurr'thu regains hit points equal to the damage dealt in this manner.

Invisibility. The ygurr'thu magically turns [Tooltip Not Found] until it attacks or until its concentration ends (as if concentrating on a spell). Any equipment the imp wears or carries is invisible with it.

Intense Self-Preservation. The ygurr'thu can use a Reaction once a round if attacked to take the hide or disengage action.