After the creation of the Warhammer Fantasy universe by Games Workshop, novels were published by GW Books and Boxtree Limited, but subsequently novels have been published by the Black Library, including translations to French and German. More than 150 novels have been set in the shared universe of Warhammer Fantasy since 1989. According to Marc Gascoigne the idea of Chaos in Warhammer was inspired by The Eternal Champion and its sequels, written by Michael Moorcock, who made use of ideas from Three Hearts and Three Lions by Poul Anderson.
https://en.wikipedia.org/wiki/List_of_Warhammer_Fantasy_novels