Hub 3: Dark Citadel

The final map. There isn't anything much that can be said about it. It's an arena.

Three waves of enemies will teleport in before one of the Death King's appears. The cycle repeats until all three Death Kings are dead. Ammo, health and artefacts will be teleported in at each stage to assist you.

Once the final Death King is dead, a portal will appear behind where the second one came from. You've completed the game.