Board Thread:Warhammer 40k General Discussion/@comment-24383134-20140221011621

I am currently about 2/3s of the way through Battle for the Abyss, the 7th? book in the HH series, so if any of the answers are coming in the later books, just tell me, but don't give details about it please.

As most of us are, or should, be aware, when Horus was being healed after he was wounded by traitorous Imperial Governor Whats-His-Name, Chaplain Erebus of the Word Bearers Legion helped to lead him astray from the path of the Emperor and into Chaos, on the orders of Lorgar. At this point in time, Chaos was still almost completely unknown to the Legions. They only regarded it as a facet of the Xenos abounding the galaxy. The Word Bearers, however, appear to have long known the true nature of Chaos, which even most of the Primarchs were unaware of.

The Word, which I took to mean the Book of Lorgar(BoL), says that the Word Bearers would find allies in the Empyrean. Which they did when a horde of Warpspawn invaded the ship that the protagonists of the book were on. The WBs were also able to unleash Warp creatures on the protagonists as well. So clearly, Lorgar knew what was up with the warp.

When did Lorgar first learn the nature of the Warp? As far as I'm aware, only Magnus was a Psyker amongst the Primarchs, at least with any active powers. Lorgar being a non-Psychic how was he able to learn/commune with the Warp? Wouldn't this make him the 'First Heretic', not Horus? Or is he just a Harbinger of the end? 