I've only read a few of the books (first 3 and Betrayer), but based on that, it almost seems like the gods had a specific plan involving Erebus, Argel Tal, and Kharn. Even if Argel Tal was partially possessed, Erebus obviously had their favor and Kharn survived some pretty crazy shit, and we already know that Kharn survives the Horus Heresy to become chosen of Khorne.
The thing that finally put Kharn over the edge seemed to be Argel Tal's death. Then, all of a sudden, the guy who didn't give a shit about fighting in the arena challenges Erebus to sanguis extremis. Was it just revenge, or had Kharn finally been molded into the berserker that Khorne had been wishlisting the whole time? Maybe not the type of madman he turns into at Skalathrax, but he probably isn't the same World Eater that tried to hold it all together. Angron is a demon now, so how is that dynamic going to work?
If they don't revisit him during the novels (which they hopefully do during the Siege of Terra), it appears that past this point he's gone to the nails and in service to Khorne. I just wonder when he actually learns who/what Khorne is. By the time the 41st Millenium rolls around, he's covered in the iconography, but it probably didn't take 10,000 years...
It was pretty badass when Erebus was getting ripped apart. He couldn't believe what was happening, and barely managed to teleport away. Gah!
Last edited by venomlust; 03-16-14 at 10:49 PM.