Barbu'Zael

BarBu'Zael is a powerful demon lord who rose to power after striking a lucative deal with a young power-hungry prince of the Viraji Kingdom in exchange for the souls of his entire bloodline, which made up most of his entire kingdom. The kingdom imploded after Barbu'Zael granted them all sorcerous powers and their souls were delivered to him directly, granting him an army of servants and souls in a short amount of time.

Barbu'Zael waits to collect all of the souls of the Viraji line as was part of the deal, and is even known to hunt members of the Viraji bloodline in order to expedite the process.