Demon Overlord is the 4th boss in the game. Just like any bosses, it's health depends on how many players there are in a server. It looks like a tank demon but in purple color. It spawns during wave 41. It has 2 attacks
- Hell Uprising - Casts purple hell spires that shoot out of the ground and moderately damage players. This ability also rises Demons, Tank Demons, Explosive Zombies, and Tank Explosive Zombies.
- Explosive Attack Shield - Casts a purple shield around itself that moderately damages nearby players and deflects incoming fire for a short period.Any player being hit by the shield will sit down automatically.
- Demon Overlord is the only summoner like boss in the game.
- It is the only boss that doesn't fire projectiles.