Transmute Rock to Lava (3.5e Spell)

As its name suggests, this spell turns the very landscape into the enemy of man, causing a deadly flow of magma from the cracks of the earth.

This spell affects all stone (worked or unworked) in its area of effect, causing it to heat and melt into lava instantaneously. Stone surfaces become lava and no longer retain their shape or support the weight of anyone standing on them. Stone weapons and ammunition are destroyed; those with magical enhancements may save to avoid destruction. Creatures made of stone must make a saving throw or be destroyed; a successful save causes them to take 1d6 points of fire damage per caster level. Petrified creatures do not gain a save and become unable to be restored by effects that reverse petrification or require remains to function.

Non-stone creatures within the area of effect are subject to the environmental effects of lava. Metal equipment exposed to this lava is heated to dangerous levels. Each round of exposure increases the temperature as described in heat metal until it reaches the "Searing" stage, where it remains there until it is no longer in contact with the lava. Metal that is not in contact with lava will decrease in heat one step per 5 rounds if not quenched in water or something similar.