THE HELMET OF SHADOWS

An artifact created by the Overlord that grants the wearer the power to control the Stone Army. In addition, removing the helmet from its resting place starts the Celestial Clock, which begins a countdown to the final battle between good and evil. The only way to stop the countdown is to return the helmet to the Celestial Clock, where it belongs. Garmadon wears the helmet while in charge of the Stone Army, and later, it is worn by the Overlord. Lost in battle, the helmet is found by Dareth, who uses it to help the ninja overcome the Overlord.

Ninja Dojo
Lightning
Elemental Blade
4.5 Bricks
Inventing Gadgets