Chalk

A creature initially born from nightmares of futility. A mindless pursuer who revels in his hunt, ripping his prey apart with his own two claws. Sometimes seen with other weapons, usually an axe or a baseball bat. After being given a tangible form outside of dreams, Chalk inhabits a dark, labyrinthine maze where the occasional failed vessel will be dropped as a sacrifice to satisfy the morbid curiosity of those who oversee the operation.  

Doesn't often speak, but when he does it's tactfully demoralizing. 

Is capable of a small degree of shapeshifting, but only really uses it to rip open a visible mouth for himself.