Dark Sun: The Scorched World of Athas
Standing alone in the heart of the Beastbarrens, the Pristine Tower is an astonishingly old relic of ages past. Most people know only that the tower is a structure of pure alabaster stone rising out of the desert that has somehow resisted being swallowed by the sand. Most people do not to approach the Pristine Tower, for a gruesome fate befalls those who come too close. Creatures that sustain physical wounds within a few miles of the tower fall prey to the transformative plague that fills the Beastbarrens with loathsome monstrosities.
The tower was mentioned in the Writings of Kalid-Ma as a place of great power.