Celestial Clock

The Celestial Clock is a device seen in LEGO Ninjago: Masters of Spinjitzu. It is a massive machine with a large clock at its core and several sphere-tipped metal arms rotating around it. It rests atop a high mountain on the Island of Darkness. The clock was designed to Countdown to the Final battle against good and evil, but when the clock strikes zero, It'll activate an unspeakable weapon.

Island of Darkness
The Overlord led Lord Garmadon to the Celestial Clock and told him to take the Helmet of Shadows, which allowed the Celestial Clock to begin its countdown. The Overlord later told Lord Garmadon that their ultimate weapon would be ready just in time for the final battle, as dictated by the Celestial Clock.

The Last Hope
At the suggestion of Misako, the Ninja attempted to halt the countdown by stealing the Helmet of Shadows from Lord Garmadon and returning it to the Celestial Clock. Unfortunately, they were unable to find the Helmet's pedestal in time, replacing it moments after the countdown finally finished. The Celestial Clock proceeded to release beams of energy between the many spheres orbiting its core, eventually firing the ray straight into Lord Garmadon's camp. As the Overlord gloated about the imminent victory of darkness over light, the Garmatron began to take shape within the energy beam of the Celestial Clock.