Board Thread:Warhammer 40k General Discussion/@comment-25618639-20150807010020/@comment-26603023-20151021200533

I know this is an older thread, but I hadn't seen this before.

IIRC, the pact with the Chaos gods was in regards to the "gifts" he wanted to impart to his "sons", the Primarchs. Hence, the protective sigils and sorcerous icons seen by Horus in his flashback.

It's implied that the Emprah had to bargain for what Horus fought for and won. Meh.