Bonecreeper

A disturbing new semi-undead monster for your OSR game, perfect for guarding the entrance to a catacomb, or ruined temple, or anyplace a graveyard may be found.

Bonecreeper
HD 4
AC 18
Atk 1 bite (2d6), 2 claws (1d6), 1 tail (1d6)
Save 13
Move 15 (12 burrowing)
CL/XP 6/400
Special: Carrion stench

It is whispered in secret places that if an innocent is beheaded in a graveyard on the night of the bloodmoon, then a black caterpillar will writhe from the victim’s neck and burrow into a grave. On the next bloodmoon, a bonecreeper will erupt from this graveyard. An undead beast roughly 20 feet in length, it has four clawed legs, a spiny serpentine body, and a bone demon’s face. The bonecreeper attacks with its sharp teeth, its claws, and its tail. Moreover, its carrion-hide and bone-spiked body emit a stench that causes all within 60 feet to suffer a -2 penalty to hit; a saving throw must be made each round to withstand the effect. Bonecreepers collect humanoid skulls, piles of which are found in their subterranean lairs. If a party facing this abomination offers a freshly (less than 12 hours old) severed humanoid head, the bonecreeper will accept the sacrifice and not attack the party for the next 24 hours.