An insectile devil, fighting with a spear and utilizing cold attacks, from the Nine Hells of Baator. They are the most alien of the Baatezu, having mental processes humanoids would consider insane. The tiefling
s they produce, kept in insane asylums by humans, pass as sane to gelugons.
I think the summoning abilities of devils should be reconsidered. Starting with a single gelugon, my party eventually had to fight off 3 gelugons, 8 osyluths, and however many lemures they all felt like summoning.