Boneless

Medium Undead, Chaotic Evil

AC: 12

Initiative: +2 (12)

HP: 22 (4d8 + 4)

Speed: 30 ft.

STR: 15 (+2)
DEX: 14 (+2)
CON: 12 (+1)
INT: 1 (-5)
WIS: 10 (+0)
CHA: 1 (-5)

Skills: Stealth +4

Resistances: bludgeoning

Immunities: poison

Condition Immunities: exhaustion; poisoned

Senses: Darkvision 60 ft., Passive Perception 10

Languages: understands Common but can't speak

CR: 1 (XP 200; PB +2)

Habitat: Any

Abduct.

The boneless needn't spend extra movement to move a creature it is grappling.

Compression.

The boneless can move through a space as narrow as 1 inch without expending extra movement to do so.

Actions

Smother.

Melee Attack Roll: +4, reach 5 ft. Hit: 7 (2d4 + 2) Bludgeoning damage. If the target is a Medium or smaller creature, it has the Grappled condition (escape DC 12). Until the grapple ends, the target has the Blinded and Restrained conditions, is suffocating, and takes 7 (2d4 + 2) Bludgeoning damage at the start of each of the boneless's turns. The boneless can smother only one creature at a time. While grappling a target, the boneless can't take this action again.

Bonus Actions

Unraveling Flesh (1/Day).

Wisdom Saving Throw: DC 11, each creature within 30 feet that can see the boneless. Failure: The target has the Frightened condition. Failure or Success: The boneless moves up to its Speed without provoking Opportunity Attacks.

Find this creature in the encounter builder

Source: Ravenloft: The Horrors Within, p. 238 - Licenses and attribution