Remix and I'll give you a battle theme!
This is the final boss in my DND campaign. Basically, a powerful wizard with weapons he enchanted, who believes himself to be a god, and every time he dies, he's reborn as a child, losing more and more of his humanity each time. The only way to beat him is to use a weapon that destroys his soul upon his death. He doesn't use instant death traps. Before the fight, he will make a pocket dimension to fight in. And his sizable army will fight alongside him.