The Host of Suffering is a death knight order under the command of the Lich King. It succeeded the death knights of Acherus who were, for the most part, freed of the Lich King's will after the Battle for Light's Hope Chapel.
Like in Acherus: The Ebon Hold before, there are three different death knight masters, each one teaching the adepts a path of the abilities of a death knight.
By order of the Knights of The Ebon Blade based in Icecrown carried out an assault against the new death knight order, located underneath Icecrown Citadel itself with Malykriss still under construction. During the attack Orbaz Bloodbane was killed.