The Abyssal leech-fiend is roughly humanoid in shape, with dark slug-like skin covered in mucus. Its head is joined by a short thick neck and its face has no discernible mouth but is dotted with several small black beady eyes. Its two long flexible snaking arms each end in a horrific flat circular mouth filled with needle-like teeth.

Abyssal leech-fiends are spawned in the deep fetid swamps that lie in several of the Abyssal layers, but many have somehow found their way to the material plane where they lurk in similar environments.

Their preferred method of hunting is to lie in wait, submerged beneath the dark waters until prey passes near enough for a quick strike. But they are also not beyond sneaking into an encampment or nearby village in the dead of night if they think there is a possibility of approaching a sleeping creature undetected. The leech-like mouths on the ends of their arms secrete a pain-numbing chemical: when used on a creature unaware of their presence it is possible they may not even feel it (a DC 14 Perception check - made with disadvantage if the creature is asleep - is required to feel the attack). The fact that a Abyssal leech-fiend was around may not even be known till the following morning and the discovery of withered drained corpses.