User blog comment:Jasca Ducato/Assassin's Creed: Revelations (360) - Official Assassin's Creed Wiki Review/@comment-4519956-20111117183754/@comment-202.124.75.37-20111118103315

SPOILER! (Not much of a spoiler now, since the game out) It isn't an Apple Of Eden. It was another of those Maysaf keys.They each have a part of Altair's life. There are actually six, but Altair's corpse was holding the sixth. Altair locks himself into his library. And Subject 16 (aka Clay) has actually made a virtual body of himself in the Animus. That's why he is stuck in the Animus. Every personality in him was put in the Animus.