Bhaalspawn
The Bhaalspawn are entities from the Forgotten Realms setting of Dungeons & Dragons, whose brief but dramatic influence on the realms occurred during a short period towards the end of 2nd edition.
As their name suggests, the Bhaalspawn are the semi-divine offspring of Bhaal, Faerun's God of Murder. Apparently warned by prophecy of his death during the Time of Troubles, Bhaal enacted a plan to resurrect himself; impregnating myriad women of myriad races, from the core PHB races to giants and dragons, Bhaal created an army of sons & daughters carrying slivers of his essence. In the event of his death, these Bhaalspawn would be compelled to fight and slay, both the mortals around them and each other, until the influx of murdered souls and slain Bhaalspawn would rejuvenate the slain Bhaal and restore him to life.
Amongst fans of Baldur's Gate, the /v/ trilogy that covers this plot, Bhaalspawn is generally used as the term for the protagonist.