Board Thread:Warhammer 40k General Discussion/@comment-98.81.158.208-20140213190331/@comment-8881468-20160114114243

you mean the 2nd book of the HH series, where Horus is under the spell of a chaos blade and then is shown a vision of a potential by the chaos corrupted Erebus to sway him to the dark gods. I would not take that as truth.