From Warhammer 40k - Lexicanum
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22:29, 13 May 2013
:3. The XI Primarch is mentioned to have committed some horrible crime, which not necessarily encompasses corruption. It might simply be something un-imperial like democracy, tolerance for xenos or tech-heresy.
:4. You take invisibility literal. Mortarion for example had the talent to hide in the shadows, Night Haunter loved surprise attacks, Magnus and the Thousand Sons fought their wars from afar with their psychic powers, Alpharius hid amongst his men unseen to outsiders... --[[User:DetlefK|DetlefK]] 00:16, 24 April 2013 (CEST)
The actual reason the two unknown legions exists, as GW themselves have said, is to give table-top players the opportunity to make their own chapters with their own history. More recently, with the success of the Horus Heresy novels, the authors will drop hints here and there without stating anything explicitly as they can't actually say more. (This is one of the first things I read on the GW website years ago when I was just getting into it, now I'm having trouble finding a citable source).
More interestingly, the Blood Ravens are being heavily hinted at as a successor chapter, in effect loyal remnant, to the Thousand Sons. In the novel, a small expeditionary fleet was absent from Prospero, several lines throughout describe visions of the future consisting of ravens and symbols.
