Lightning Rod

The Lightning Rod is a placeable object that can be placed anywhere in the world. There are currently no known uses for it. It can be further upgraded into a Lightning Trap using 2 Thunder Crystal which act like a tesla tower when placed within the world.

Source

 * Crafted: 2 Ironite Ore + 1 Hardstone Ore.

Trivia

 * It's one of the only object that can be placed on islands, along with traps and flags.