Enable the "10,000 gold per level" code. When you defeat the Wraith, you should have 40,000 gold. Next, shop and buy 20,000 gold worth of invincibility and 20,000 gold worth of the Hammer. When you run out of hammers, Skorne should at least have half of his life gone, and you will still have invincibility throughout the entire battle. Iif you run out of invincibility, use a second player as a sacrifice.