Kachlian

Consume Soul. A creature slain by the kachlian can't be restored to life unless the kachlian is killed within 24 hours of slaying the creature. After 24 hours, the soul becomes part of the kachlian, and the creature can be restored only with a wish spell.

Spellcasting. The kachlian is a 7th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 14, +6 to hit with spell attacks). The kachlian has the following wizard spells prepared: Cantrips (at will): chill touch, minor illusion, ray of frost, shocking grasp 1st level (4 slots): detect magic, hideous laughter, identify, magic missile 2nd level (3 slots): blindness/deafness, darkness, see invisibility 3rd level (3 slots): counterspell, slow 4th level (1 slots): confusion

Multiattack. The kachlian makes three attacks with its tentacles.

Tentacle. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 17 (3d8 + 4) bludgeoning damage. If the target is a Large or smaller creature, it is grappled (escape DC 16). The kachlian has three tentacles, each of which can grapple only one target.