Hephaestus' Throne

Hephaestus' Throne is the throne which Hephaestus sits on in the Hall of the Gods. It is in the male's side of the Hall of the Gods, between Apollo's Throne and Hermes' Throne.

Description
The throne is a simple metal chair, but it acts like a robot. His throne is like a "La-Z-Boy type thing covered in bronze and silver gears" and "whirring with secret gears and mechanics" as Percy describes it. The throne also has a defense system that can shoot electricity.

The Last Olympian
The throne defense system was triggered while Percy was fighting Kronos. It shot bolts of electricity in all directions which hit Kronos in the face when he attacked Olympus.