Ancient books record that the first imperial emperor used his own Omega glands as bait to seal the giant beast, and every emperor since then had to perform a "blood sacrifice" on the night of the blood moon. But three hundred years ago, the ceremony was suddenly changed to recruit civilian Omegas. In fact, in order to continue the Alpha bloodline, the royal family used the glands of sacrificers to refine the "potion of immortality."
Intent: abo fanfiction