Board Thread:Warhammer 40k General Discussion/@comment-69.143.134.163-20150419161351/@comment-24037808-20150520155207

Still, i think that something betwen the 2 missing legions happened BEFORE the arrival of Russ.

If in the first place it could be "possible" for the Wolves to wipe out an entire Legion easily, it is quite inesplicable why GW does not develop such an awesome fact, losing material for a lot of tales.

The most logic speculation is that Russ wiped out the 'remains' of the evil legion, while the good one was entirely annihilated (maybe someone survives, but nothing noticeable).