Bion

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Bion was a trained ex-soldier who was hired by the Order of the Ancients to eradicate the Medjay bloodline.

Bion travels to Emsaf's home in order to kill him, only to discover that he already left, rushing after him, but not before he butchered Merti and Ebe.

Bion outsmarted Emsaf, he used the corpse of a merchant he killed as a decoy, tying him to his horse with ropes. Emsaf thought his arrows seemingly killed Bion, he exited his hiding spot only to be stabbed from behind by Bion, who severed his spinal column. Now only able to speak and see, he was interrogated by Bion who wanted to know where were the other Medjay, but understanding that he would never speak the killer swiftly executed him, stabbing him again, this time in the eye.

Bion arrives at Djerty, captures interrogates and kills Hemon and Sebestet, he discovers that Sabu and Bayek are now the last remaining Medjay. Bion discovers Bayek's group but is caught in a trap, and is injured, but escapes. Bion spends several years recovering and training.

Bion saves Aya from horse thieves at a watering hole. Aya Unknowingly lead Bion right to their training camp. Bion arrives at the camp where Bayek and Sabu are training. He lets loose multiple arrows that hit Sabu, with Bayek’s stomach being sliced by Bion's blade shortly after. All three are ulimately injured in the ensuing battle, with Sabu choosing to push Bayek into the nearby river to save him, in doing so he is struck down and killed by Bion. Bayek falls unconscious and is swept away safely by the river. Aya arrives back in Siwa. She meets her ill aunt, friends and Ahmose. Bion arrives, and begins to ask locals about Bayek, including Aya whom he holds hostage in her home for a time.

Bayek and Aya head to his mother’s home. Bion lies in wait and they all battle, Ahmose critically injures Bion. Bion reveals in his dying breath that Raia ordered all of the Medjay's deaths.