That very much sums up the setting of GURPS Banestorm, the latest incarnation of Yrth, the oldest fantasy setting originally designed for GURPS. To expand on the story mentioned in the blurb, the world of Yrth was originally populated by Elves, Dwarves and Gnomes, Orcs and Ogres. But a faction of Elves, deciding to rid themselves of the destructive Orc race, designed a powerful magical ritual called the "Orcbane". It did not work as planned.