Pit of bones. The Abominable Skullker assembles his body from the collected bones of his victim's wich hey collects in a pit. To surprise enemies, he waits until a creature entered his pit of bones and emerges to kill his prey.

Skeletal spawn. On each turn de Abominable Skullker summons 1d4 Skeletons with the modification that each only has 1d4 health. Every HP point of the skeletons is deducted from the current HP of the Abominable Skullker. The Skeletons can emerge from anywhere as long as it within the Pit of bones.

Pit shift. As long as the Abominable Skullker remains in the Pit of Bones, it can use its movement to disassemble at one place in the pit and reassemble in another place in the pit. This movement would not provoke opportunity attacks.

Hitting the floor. If the loose bones in the pit are targeted specifically the bones take half damage (AC 9). AOE spell effects treat the pit and the Skullker as one unit. This means the Skullker only takes damage 1-time per AOE.

Multiattack. The Abominable Skullker makes three attacks: Two with its claws and one with its mandibles.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) piercing damage.

Mandibles. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) piercing damage.