Board Thread:Warhammer 40k General Discussion/@comment-4851119-20140118095944/@comment-58.178.135.30-20140415233359

The 2 missing primarchs are called "the purged" & "the forgotten" which indicates one was cast down through violence - perhaps because said primarch attempted a coup or tried to set up his own empire - & probably killed while the other was imprisoned or exiled or quit & left the empire because of some disaggreement about the empires means &/or goals - most likely the empires extermination of even peaceful & benign xenos. One thought I had is that this primarch could be behind the Etherials & the Tau.