The half-soulless are half-human and half-soulless beings found deep in the Underground Pass, in the cages found north of Iban's Temple, placed on the top of flat cave stalagmites. They are people that entered the Underground Pass as humans but have partially deteriorated into the soulless due to the voice of Iban.
During the Underground Pass quest, the player receives a pair of gloves from a dwarf named Klank, appropriately called klank's gauntlets. Without the protection from the gauntlets, the half-soulless will bite players who search their cages, inflicting damage. Players search the cages as they must retrieve the dove skeleton in order to defeat Iban. Finding it might take a while, as there are many cages.