Atlas is a Hardmode enemy which spawns on the Surface Astral Infection biome. It is initially idle, in which it stands still and occasionally turns around. If it notices the player, it will walk slowly towards them, attempting to jump over any obstacles in the way. When Atlas gets close enough to the player, it will uppercut them with its big arm and launch them far away, after which the attack will enter a short cooldown. If it loses sight of the player for long enough, it will return to its idle behavior.
- Using a Cobalt Shield and its upgrades completely nullifies the uppercut's knockback.
- There is a 1 in 1000 chance that the uppercut attack will knock the player about 3 times farther away.