Index Chaotica (Background Books)
Index Chaotica are a series of background books published online by Games Workshop, beginning in October 2013.
Though the Chaos Space Marines were once heroic defenders of Mankind, each has sold his allegiance to the Dark Gods in return for surreal and twisted powers. The Index Chaotica series explores their fall from grace, their fell abilities and their bloodthirsty wars, along with the violent champions that lead them in their search for eternal glory.
Books in the series
Garden of Nurgle
Juggernauts of Khorne
Eye of Terror
Index Chaotica: Apocrypha