Skulking Cyst

Armor Class 14

Hit Points 123 (19d6 + 57)

Speed 30 ft., swim 30 ft., climb 30 ft.

Initiative +4

Damage Immunities necrotic, poison

Condition Immunities blinded, deafened, exhaustion, frightened, poisoned, prone

Senses blindsight 60 ft. (blind beyond this radius), passive Perception 12

Languages understands the languages it knew in life, but can't speak

Challenge 4 (1,100 XP)

Multiattack. The cyst makes two intestine loop attacks. It can use Blood Drain in place of one attack.

Intestine Loop. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 7 (1d6 + 4) bludgeoning damage plus 2 (1d4) necrotic damage, and if the target is a Medium or smaller creature it is grappled (escape DC 14). The cyst can only grapple one creature at a time.

Blood Drain. If the cyst is grappling a creature, it can attempt to drain its blood. The target must succeed on a DC 14 Constitution saving throw or take 7 (2d6) necrotic damage and its hit point total is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. If the target's hit point maximum is reduced by 10 or more, the target is affected by the necrotic cyst spell. Constructs, elementals, plants, and undead are immune to this damage.