The Mount of Eternal Shadows, located on the Island of Darkness, is the hideout of the Stone Army as well as the two major antagonists of the series. The slopes of the mountain are where Dark Matter was harvested, and the Celestial Clock was found on its summit.


The Day Ninjago Stood Still

After raising the Island of Darkness from the sea, Lord Garmadon was told to climb the Mount of Eternal Shadows by the Overlord. When he reached the summit, he found the Celestial Clock and donned the Helmet of Shadows, setting the clock into motion.