Actions

Multiattack. The Lost makes two arm spike attacks.   Arm Spike.  Melee Weapon Attack: +6 to hit, reach 5ft., one target. Hit: 8 (1d10+3) piercing damage.   Embrace. Melee Weapon Attack: +6 to hit, reach 5ft., one target. Hit: 13 (2d10+3) piercing damage, and the target is grappled (escape DC 13) if it is a Medium or smaller creature. Until the grapple ends, the target is frightened, and it takes 12 (3d8) psychic damage at the end of each of its turns. The Lost can embrace only one creature at a time.

Reactions

Tightening Embrace. If the Lost takes damage while it has a creature grappled, the creature take 8 (2d8) psychic damage.