Dark Sun: The Scorched World of Athas
Kalidnay was once a great power in the southwest corner of the Tyr Region. That changed centuries ago when a force unknown to the other sorcerer-kings abruptly destroyed the city-state, leaving its citizens slain and its sorcerer-king, Kalid-Ma, missing. To outside observers, one day Kalidnay was a vibrant city; the next, it was an empty shell bereft of life.
Evidence was found in the Golden Tower of Tyr that suggested that Kald-Ma was attempting to accelerate his metamorphosis into a dragon and that Kalak, Hamanu and Borys of Ebe marched on the city and destroyed it.