Storm Diver's Additions Mod/ScanDrone

The ScanDrone is an enemy that spawns around the Vortex pillar. They will slowly fly towards the player, and charge up and fire out a bolt which inflicts the debuff, removing all defense from the player. They are also capable of flying through tiles.

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Trivia

 * ScanDrones are the only vortex enemy that can pass freely through tiles.