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From Terraria Wiki
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The Martian Engineer is a Hardmode, post-Golem enemy that appears during the Martian Madness event. They have the ability to build Tesla Turrets on the ground in front of them.
- Since Martian Engineers can potentially create an army of turrets if left alone, it's best to take out these enemies before they spawn too many turrets.
- You may want to build traps to destroy the turrets and kill the Martians.