[[Category:]] Tarchamus' volcano was an extremely powerful spell created by the legendary Netherese arcanist Tarchamus. The spell harnessed the power of Phlegethos to create a volcano capable of destroying cities. In approximately -3500 DR, Tarchamus used the spell to destroy the floating Netherese city of Tenish. The Mavin's create volcano spell may have been an attempt to recreate Tarchamus' spell, although the two spells functioned differently. In 1478 DR, a group of adventurers including the tiefling Farideh and her sister Havilar used the spell to destroy Tarchamus's secret library. Whether or not the scroll containing the spell survived the cataclysm was unknown.