War of Three Waters — Douglas Niles

THE HEART OF DARKBLOOD...
...anchors the Nameless one to the world and spews forth a vile tide of death and destruction across the realms of magic and of man. The war between the three lands in the dark lord's favor, as humans and Faerines rally valiantly to make one last stand against his countless minions...

But through the powers of Aura, the Man and Woman of Three Waters have seen their destiny. They must travel to the bleak wasteland beyond the Watershed and--with the legendary sword of their ancestors--strike at the very heart of evil.