Electromagical Battery

The Electromagical Battery is an untradable item used to open Relos' Library.

Obtain
The battery can be found on top of a mast on a sailboat at the Corkus Docks. To get to it, climb and parkour up and across the fences to get to the Electromagical Battery mob at the top of the ship. The mob drops one Electromagical Battery when killed.

Usage
To unlock the library, head to Relos and drop the battery into the hopper.

Trivia

 * In the past, the battery could be worn as a helmet, though it wouldn't provide any stats. All non-helmet items wearable pre-1.18 were fixed in 1.18.
 * Switching servers will render the item useless.