Ripped from the material plane, presumably saved by his deity from a Primal trap, Brock Goldenleaf tumbled through time and space before arriving in a black and swirling dimension. There, a monstrous demon introduced himself as Nebu Zerasu and claimed, among other things, that he had put the Xanzilisa into the world.
He struck a deal with Brock: kill an elf king named Avenfal. Brock refused, so he made a counteroffer: simply deliver a large ruby to Avenfal's temple at his castle on the Black Spire and place it in a sacred bowl of water there. With no other way home, Brock agreed and the demon dismissed him with the ruby back to the material world.