The Sundering: Rise of the Witch King is a mod for Medieval 2: Kingdoms and based around the fantasy world of Game workshop's Warhammer universe during the civil war between the Elves, the mod's campaign opens with the Death of Bel Shanaar in -2751 IC.
Plague Monks form the bulk of Clan Pestilens' troops. The putrid stench and swarms of flies that always surround them are a feared sign of the prescence of these acolytes of pestilence on the battlefield.