Tarchamus' volcano

Tarchamus' volcano was an extremely powerful spell created by the legendary Netherese arcanist Tarchamus the Unyielding.

Effects
The spell harnessed the power of Phlegethos to create a volcano capable of destroying cities. The gate to Phlegethos opened directly under the caster, which made it necessary for the caster to either quickly remove himself from the area or else have extremely powerful protection from fire.

History
In, Tarchamus used the spell to destroy the floating Netherese city of Tenish. Thereafter, many powerful Netherese arcanists spent years searching for the spell, only to die in traps laid to catch them by Tarchamus.

In the, a group of adventurers including the tiefling Farideh and her sister Havilar used the spell to destroy Tarchamus's secret library.