Board Thread:Warhammer 40k General Discussion/@comment-6078851-20130318203252/@comment-7186329-20130327141351

Understood, i didn`t get the refference, now i do. The only four things known about the unknown primarchs is these.

The first is that they did something that made The Emperor delete all records of them, and possibly try to kill them.

The second is that one of said primarchs is most likely dead, killed by Leman Russ.

The third is that there are no chaos space marines that claim to be from the legions of the lost primarchs, which could mean that said legions have been completely destroyed, incorporated in other legions, or still alive and missing.

The fourth one is mostly a theory. When Horus went back in time and space during his corruption in the temple of chaos, he placed his hand on the gestation tank of the II, i think, primarch and cracked it. Those cracks destroyed some of the protection that the tank provided. When the primarchs were dispersed and exposed to chaos, some got mutations from that exposure despite the protection of those tanks. The II primarch was not protected as well as the others and that over exposure to Warp energy resulted in heavy, grotesque mutation that affected his legion. For that reason The Emperor banished him from the Imperium, and that could mean he is still alive with his entire legion somewhere.