The Mountain

The highest peak on Xia, "The Mountain", unlike all other mountains, was actually alive. It had the power to devour climbers who climbed up it's slope suddenly and without warning, which made climbing up the mountain a dangerous task.

The Mountain was formed when Makuta Mutran accidentally left his "favorite sentient rock" on Xia while on a diplomatic mission. He figured it wouldn't cause any trouble unless it started eating Xians and grew into a mountain, "but what are the odds of that happening?"

The Vortixx were expected to climb up the mountain at least once in their lifetime to establish their own bravery and ruthlessness.

The Brotherhood of Makuta once tried to ship some of the rock from the mountain to barricade their own island, but it proved to be a failure after the rock decided it liked the taste of Visorak.

Several large chunks were torn out of the mountain when the Tahtorak and the Kanohi Dragon were fighting.