User blog comment:Legionaire22/My first real AT Idea/@comment-3258762-20130723213251

In other words: Guilliman is not devoted to Chaos, he is exactly like Horus in that he is slowly eased into it out of necessity.

This whole thing has a bit of a silver lining, showing how quick one is to forget mistakes and how one may not always do the different thing if put in the situation of the one who does it.

And I know Kor'Phaeron tried to sway Guilliman before, but now the Emperor is crippled, Guilliman is all that stands between the Imperiums prosperous future and its total destruction, as told by the Chaos Gods. So it's not really as easy to say no :3