This creature's bloated frame shudders with each heaving step, yet despite its shape, the thing moves with surprising quickness.
5e SRD
Dretches are among the weakest of demons-repulsive, self-loathing creatures doomed to spend eternity in a state of perpetual discontent. Their low intelligence makes dretches unsuitable for anything but the simplest tasks. However, what they lack in potential, they make up for in sheer malice. Dretches mill about in mobs, voicing their displeasure as an unsettling din of hoots, snarls, and grunts.
Lone dretches serve other demons or evil magic-users. They are erratic, filthy, and violent, and they demonstrate little sense of self-preservation.
5e Tools
The weakest of all demonkind with a plump body, thin gangly limbs, and a squat bald head
Dretch are the weakest of all demonkind. Their appearance is almost comical, with a plump body with thin, gangly arms and legs. Their squat heads are bald and they have a slobbering, stupid visage.
Dretch usually attack in hordes, using tooth and claw in blind abandon. They also have the following special abilities which they can use at will, one at a time: darkness (5-ft radius), scare (as the 2nd level magic user spell), telekinesis (as the 5th level magic user spell, up to 50 lbs), or gate (as the 9th level magic user spell) a class A demon (15% chance of success). In addition, once per day they can cause a stinking cloud (as the 2nd level magic user spell), and teleport without fail (as the 5th level magic user spell, but with no chance of error).
OSRIC