Borrowed Sight. Attacks made by creatures within 60 feet that can see Zibberak have disadvantage.

Spellcasting. The Zibberak is a 16-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 19, +11 to hit with spell attacks). The Zibberak has following Wizard spells prepared:
Cantrips (at will): Mind Sliver, Infestation, Minor Illusion, Mage Hand, Shape Water
1st level (4 slots): Absorb Elements, Cause Fear, Fog Cloud, Sleep
2nd level (3 slots): Crown of Madness, Invisibility, Mind Spike
3rd level (3 slots): Blink, Counterspell, [Slow
4th level (3 slots): Black Tentacles, Confusion, Blight
5th level (2 slots): Bigby's Hand, Dominate Person
6th level (1 slots): Mental Prison

Mind Strike. Melee Spell Attack: +10 to hit, reach 5 ft., one target. Hit: 17 (2d10 + 6) psychic damage, and if the target is a creature, it must make a DC 18 Wisdom saving throw or be incapacitated until the end of the cloud's next turn.