Infernal Tornado
(Evocation)

Range:  10 feet per level
Components:  V, S, M
Duration:  1 round per level
Casting Time:  1 day
Area of Effect:  Special
Saving Throw:  None

While the wizard is casting this spell, a dark ominous cloud begins to gather in a 1 mile-diameter region centred over the target. Upon completion of the spell, a dark, fiery tornado of fire grows from the base of the cloud until it touches the ground. The whirling mass of fire proceeds to wander about the area, incinerating everything in its path.
Each round, the tornado travels in a random direction at a movement rate of 20. The flames inflict 1hp of damage per tenth of a round of exposure for every level of experience of the spell caster. The diameter of the cylinder is about 50 feet, and anyone within 25 feet must make a Strength check each round to keep from being sucked into the cylinder by the powerful blast of winds.
The material component of this spell is a large iron pot filled with charcoal that must be kept burning for the duration of the casting. Sulphur and 500 gp worth of crushed amber must be gradually added to the pot.

