Ruinous Warhost is a Warriors of Chaos settlement building in Total War: Warhammer. Only Everchosen have sufficiently risen in power to command a true Warhost of Chaos.
Background
It takes no less than a crowned Everchosen of all four Dark Powers to be able to command and control the unwieldy Ruinous Warhost. It is a cabal of countless thousands, a fragile alliance that could shatter at any moment should the Everchosen's underlings detect weakness... or opportunity. However, those rare few Champions with the force of will and pure malice to keep the warhost together will lead a mighty horde of iron and corruption into the mortal lands, where utter destruction awaits.