Disir
Disir are intelligent carnivorous humanoids whose hideous forms were first seen in D&D Second Edition beneath the dwarven caverns of Taladas. (Those caverns which weren't flooded with magma during Hiteh's Night, anyway.) Here they serve the niche of the Balrog of Moria: the dwarves greedily dug deep, and awakened Something, gnawing at the roots of the world.
Disir are seven-foot tall but, given they live in caverns, usually hunched. They look like big slimy hairless befanged walking armadillos, with light green skin underneath. Their flesh tends flaky so, imagine the aroma. They usually go naked and don't have much use for weapons, given the sheer natural toxicity of their claws and - for those unlucky enough to be at their mercy - fangs. These attacks cause, on failure of saving throw, a painful paralysis. The slime further protects against fire. Disir also boast a long raspy tongue like a ghoul's.
Luckily disir slime loses something of its affect when liberated from its host. So, it can't be bottled for poisons or ointments; and the hunters don't bother smearing it on (say) arrows.
Disir come from eggs as asexual (basically), switching biological sex "depending on stage of life". The female-phase, presumably egg-laying, is the dominant phase; otherwise the society is egalitarian. The typical tribe numbers about fifty, around an "incubator hall". This hall is always guarded, by those females not currently involved in breeding and by those (assumed youths) in male-phase. Likewise hunting and scavenging is done in age/sex-mixed packs numbering 2-8 (2d4). Book of Lairs offers an example cavern with disir and dwarves.
Disir are natural allies to each other but enemies to everyone else, in particular dwarves because that's who've survived contact long enough to deliver a report. In the original box-set they never offer "truces or treaties of any kind" but DLA3 did allow for a limited armistice wherein certain disir paid respect to a fallen (male) chieftain.
Surprisingly /d/ hasn't made a monstergirl out of them yet but, give it time.