The Kil'sorrow are a clan of Orcs part of the Shadow Council. They inhabit Kil'sorrow Fortress[69, 81] in Nagrand. They are aggressive to both the Horde and the Alliance.
In Oshu'gun, the Kil'sorrow Ritualist torture the ancestral spirit and drain the energy of Ku're, a naaru, with the help of some demons, as terrorfiends and shivarra. They want absorb the energy to increase the number of voidspawn in their own ranks.