City of Urborg

Urborg was a city on the island of the same name, controlled by the lich Nevinyrral. It was at war with Bogardan. According to legend, Nevinyrral was outmaneuvred and the city was swallowed by a volcano. The necromancer used Nevinyrral's Disk to destroy what was left of Urborg in order to deny his enemies any of the magical trove that might have survived.