When the rivers of the world turn to blood it is a sign that Khorne has regained ascendancy at the head of the unholy pantheon of the Realm of Chaos. The time of the Blood God has come!
Source: Warhammer Fantasy: 8th Edition
River of BloodURL Copied!
A unit that moves or charges through a River of Blood is counted as causinguntil the end of the following player turn, so ghastly is their blood-slicked appearance.