Level: 7
Range: Touch
Duration:  1 turn
Components: V, S, M
Casting Time: 1 round
Saving Throw: None
Area of Effect: Special

This spell creates a large,
boulder-sized sphere of force that can be fired by a catapult.
The siege sphere will last for one complete turn before it fades
out of existence, so it must be fired within one turn of the
spell’s casting. The siege sphere can take several different
forms, and the type of sphere to be created must be decided
when the spell is memorized. The siege sphere is as hard as
adamantine steel before it is launched, and can only be
destroyed by a wish, dispel magic, or disintegrate. ARer the
sphere is fired, it will take on a different form that depends on
the attack type of the sphere. Regardless of the form that the
attack takes, the siege sphere is dispelled after it performs its
attack. Different types of siege spheres are described below.

Liquid Fire: When the sphere strikes its target, it instantly
shatters, spraying a mass of liquid fire over an area 30
feet in radius. All combustibles in the area of effect will be
ignited. Any creature struck by the liquid fire will take 2d4
points of damage per round for 2d6 rounds unless the fire is
doused or the burning fluid is washed off. The material
components for this form are a drop of pitch, a bit of phosphorus,
and a pinch of diamond dust.

Crystal Shards: This siege sphere splinters apart 30 feet
above the ground, raining down crystal shards in a 20-footradius
circle. Each creature in the area affected will take
5d6 points of damage regardless of its armor class. The
material component is a sample of sharp diamond flakes.

Wrecking Ball: Upon nearing its target, the sphere’s density
dramatically increases so it strikes with three times the
impact (and damage) of a heavy catapult. The material
components are a lodestone and a pinch of diamond dust.