Chaos Elemental

The Chaos Elemental is a Hardmode enemy that spawns on pearlstone or pearlsand in the cavern layer. It runs around and teleports quickly, attempting to damage the player by making contact. It will teleport anywhere in a random position within 20 tiles from its target, but at least 4 tiles away, and only into a space that is at least 4 blocks tall and 3 blocks wide. It will not teleport into lava, though it can easily fall into it after teleporting. Chaos Elementals are immune to the Poisoned, Venom, On Fire!, Shadowflame, and Cursed Inferno debuffs.

Like many Underground Hallow enemies, Chaos Elementals have a glowing pink after-image.

Trivia

 * s are magical entities who embody/personify a force of nature. Historically, elementals personify one of the four Classical elements: earth, water, air or fire (sometimes plant, but never Aether). introduced elementals that were fusions, and other unconventional elementals.

History
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