Eruption

You call upon the destructive nature of lava, allowing you to cause a small eruption of lava and magma within range of the spell. Everybody within the 5 feet of the effected area must make a Dex. save against your spell casting save, and on a fail, they take 8D10 of fire, and 4D6 of bludgeoning damage, and half as much on a save. If anyone or anything start, end, or enter the eruption pathway, they take the amount that was used on the 1st round of the spells use, at half damage. Anything that is non-magic, and flammable, but not worn by anything, is instantly caught on fire, or melted.

When this spell is cast as a ritual, you can channel the power into a small blast radius, causing 100 fire damage to anything in a 25-foot cube. At higher levels, this damage is increased by 25.

At 6th and higher level, your eruption becomes both more powerful and chaotic in its destruction. Add a D10 for fire and D6 for blundeoning at every level increase. 

At 8th level, you can cast this on an active volcano, allowing you to control what happens during the eruption in terms of direction of the explosion.

At 9th level, you can cast this on an in-active volcano.