Bastion

Bastion, the Pillar of Adamant, Foundation of Ambition, is a single, vast, multi-faceted diamond. Many theologians have used its existence to justify grasps for power, but others consider it to stand for the life-drive of all mortals.
It is the Keystone of the Eternal Labyrinth, a terrible, yet beautiful place ruled by Q’vas, the Marquis of Mirrors.