Erywin

Can move through walls and objects, and through creatures' spaces (but can't end its move in one).
After taking damage, move up to 2 spaces for free.
- •Slime Splat.1d6+8.
Range 4. On Damage: the target is Slimed until cleaned.
- •Gobble.1d6+20.
Move through a Slimed target
(passive) No Speed; cannot be moved, Grappled, or Frightened. Heroes who leave the keep cannot be targeted by or target it.
Its first attack of the encounter is made with advantage and cannot be Defended against.
- •Chew the Walls.
(Reach 4) 1d6+16 damage to one hero. On damage: Restrained (DC 15 STR or DEX to escape).
- •Swallow.
(Reach 1, target must be Restrained) 1d4+30 damage. Cannot be Defended against.
- •Beckoning Halls.
(Reach 8) The 2 furthest heroes make a DC 15 STR save or are pulled 6 spaces toward it.
Whenever a hero fails their save against Beckoning Halls, a nearby chest or tapestry unfurls into a Splinter Spawn minion (Reach 1, 1d12).
The facade sloughs off, stone becomes visible muscle and teeth. Armor drops from Heavy to Medium, and Chew the Walls’ Reach increases to 6.
Caer Gullet is dying! 100 more damage and it collapses. Until then, it always chooses Swallow (no longer requiring a Restrained target) and pulls the nearest hero to it for free at the start of its turn.