Mavin's create volcano

Mavin's Create Volcano was a 10th-level Arcanist spell created in the days of Netheril.

Casting Mavin's Create Volcano would produce a minor earthquake in the effect’s area. Within a week, ash and steam would be seen pouring from the earth. Within a month, a complete, erupting volcano would be present.

Drawbacks
This spell was never cast in Netheril‚ but every arcanist that looked at its formula was convinced that it would do as promised: create a volcano. Numerous ideas for it use were brought forward but the threat to other ground-dwelling creatures was too great.

Materials
The material components for this spell included a mantle of sewn diamonds that acted as a double-strength ring of fire resistance, a helm of brilliance, and a mythallar, which was placed at the site of the volcano.


 * This spell can no longer be cast due to the restrictions placed on magic by Mystra after the near cataclysmic destruction of The Weave by the casting of Karsus's avatar in -339 DR.