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The hybrids were a humanoid species directly descended from those Isu who chose to interbreed with their human workforce. As a result of this interbreeding, hybrids were born without the artifical neurotransmitters that forced humanity's subservience to their Piece of Eden-wielding Isu overlords.
Over the subsequent generations, the hybrids and their offspring were assimilated into the general human population. Consequently, the concentration of Isu DNA in their own genome became diluted with each generation. Certain bloodlines directly descended from the hybrids, however, possessed fractionally higher levels of Isu DNA in their genome—resting somewhere between the 0.0002% of normal humans and the 5 or 6% of Sages—which allowed their scions to naturally access Eagle Vision, to more fully interact with Pieces of Eden, much like their ancestors had, and in the case of Sages meant that they would serve as a reincarnation of Aita. 
Considering the abilities of Tainted Ones Like Kassandra and the knowledge and abilities shown by the sages, Adam and Eve were most likely extremely physically and mentally powerful. In The Truth Adam and Eve were shown free running from ground level to the top of Eden extremely quickly.
- Assassin's Creed II (first appearance)
- Assassin's Creed III: Liberation (mentioned only)
- Assassin's Creed: Odyssey – The Fate of Atlantis: Judgment of Atlantis