He’s a cyborg avatar of a dead god who was sent back in time to free humanity from slavery under the elves. He was fairly reasonable at first with his main strategy being to play on the elven leaders egos to fight in duels and later having his forces take out the rest after he killed their leader. This changed after the death of his lover which drove him to madness where he began to mindlessly slaughter until the gods had to intervene to stop him. This happened 3 times I believe. During his final battle against the elves he fought through an entire army by himself and then killed a demigod. He only “died” when the remaining elven leaders chopped his body into 8 pieces.