Hail of stone

Hail of stone was a simple conjuration spell that created a brief hailstorm of rocks to fall upon an opponent. It was common among spellcasters living in the Underdark and among the wu jen of Kara-Tur &mdash;particularly those specializing in the power of elemental earth. In some worlds, shamans maintaining a relationship with a stone spirit also utilized this spell.

Effects
After a full six seconds of casting  or longer, a localized hailstorm,    roughly in the shape of a 40-foot-tall (twelve meters) cylinder with a radius of five feet (one and a half meters),   was instantly created wherever the caster designated within a medium range, ending as soon as the initial rain of stones fell. According to some earlier scholars of magic, the radius of the storm grew larger as the caster excelled in magical skill. The "hail" were stones heavy enough to cause injury to persons and objects struck.

The spell could not be cast within the phlogiston between the crystal spheres.

Components
The spell required verbal, somatic, and material components. The caster would hold a chip of jade,   which was blown upon during the final moments of casting. The chip would spark, burst into a green flame, and vanish, just as the stones began to fall. In the Kara-Turan tradition, the jade chip was instead tossed in the direction of the target.