FOR THE EMPEROR!
I've seen this franchise mentioned several times on this forum, but there doesn't seem to be any official thread on it, so here it is. I got into it about half a years ago or so, and I've read the first five Horus Heresy novels, the first Ultramarines Omnibus, and now I'm reading the Ahriman Omnibus. I've also listened to the audiodrama The Calculus of Battle. I haven't played the game yet beyond on Kill Team mission and a brief tutorial, but I am putting together a Tzeentch Daemon/Thousand Sons/Scourged army for Vigilus.