Chaos Elemental

The Chaos Elemental is a monster that appears only in the Underground Hallow biome, after defeating the Wall of Flesh in the world.

The Chaos Elemental looks like a normal players wearing some kind of armor. It is coloured pink and emits some light. On its move, it leaves a small trail of light similar to the effects of the Ninja vanity outfit.

The Chaos Elemental can teleport around and will do so if isn't being hit/can't hit the players, and in addition, has a very good knockback defence. All of those make fighting it quite a hard deal for an unprepared player. It has about 200 Health points and can hit up to 60 damage.

A good strategy would go to a small space where you can push it against the wall, with a average knockback weapon and just keep attacking it until it dies.