Artanail: B13 was part of a litter of artificially birthed Augments, collectively called the "A-B- Series. The very first of them, "b1", Was trained to be a child soldier. he was a prototype. A test-run, and failure. B1 could not take the physical and psychological agony that came with Being an AB series augment, and it would only get worse as he got older.

B1 began to kill his siblings 1 by 1, to save them from their future. He was shot dead in his tracks before he could Slay b13, and thus:b13 was the only member of the litter to survive.

B1's warnings were correct. it was this same agony that would later drive adult B13 insane