Elemental Overlord

The Elemental Overlord is usually the third Boss accessed from a Boss Teleporter a player will face. There are two strategies that will allow you to kill this boss insanely easily. The Elemental Overlord drops 7,680 Gold.

Wall-Hugging
Equipment: Starter Pistol or higher, Speed-enhancing item

This strategy is the easiest and has a very high success rate. After you spawn into the arena, run with a speed-enhancing item to the edge of the arena. When the Elemental Overlord spawns, fire at him with a weapon and keep moving along the edge of the arena. His boulders will either spawn out of the map or won't be able to hit you as long as you keep hugging the wall. If he is getting close to you, use your speed-enhancing item to run along the wall until you are a safe distance away.

Tree-Luring
Equipment: Glass Uzi or higher, Speed-enhancing item, Firecrystal Armor or higher, Healing item

This strategy is still very easy, but has a lower success rate and requires good Armor. After you spawn into the arena, run with a speed-enhancing item behind the closest tree. Then, fire upon the Elemental Overlord. If a boulder spawns and does not get caught in the tree, get hit by it and use your healing item.