Board Thread:Warhammer 40k General Discussion/@comment-25222488-20151014231624/@comment-106.71.42.94-20170724181622

I'm 2 years late but....

Cypher is a Fallen Angel, one of the "traitor" Dark Angel Space Marines from the Horus Heresy in 30k. I wont go into them (plenty of lore) but the reason he killed Regan was not because he was a heretic, coward or liar. It was because he now knew the secret all Dark Angels keep so well, that the Dark Angels "betrayed" the Emperor oh so long ago. Hence why he said "Please, only you and I know the secret you can let me live I'll tell no one else". Clearly he could not risk that.

To put it into perspective. If a rival chapter, lets say Blood Angel company was investigating a planet of Chaos Space Marines. The Dark Angels show up to assist. The Blood Angels discover they're something more then Traitor Legions and take one prisoner for interrogation. The Dark Angels would kill, every civilian on that planet, every guardsman, and then wipe out the Blood Angels themselves just to prevent that Fallen Angel prisoner spilling the beans.