Well of Souls

"This is an evil place, Spiril; on the Night of Eternal Darkness, the Dark Master may be freed from his prison within the mountain"-Fira warning spiril about the well of souls
The Well of Souls, known to Dragons as the Mountain of Malefor, is a large mountain located on the border between the Dragon Confederation and Avalar. Beneath the mountain lie the ancient Catacombs.
=Geology and internal structures=
The mountain, like nearly all of the Dragon Homeworld, was constructed by the Precursor Civilization. Originally a conical structure, during Malefor's rebellion against the High Council, the ancient Precursor-constructed foundations cracked, creating a series of spires all over the unstable mountain. the mountain is littered with many caves and chambers, including a temple. Malefor and his forces constructed a fortress here during his ultimately unsuccessful campaign.