Shadow Engines

This spell creates the illusion of as many as four siege engines. The casting priest may choose from ballistae, siege towers, catapults, rams, or any combination thereof. Like the creatures created by the spell Shadow Monsters, these illusory engines have at least a tenuous reality and can inflict damage on enemies.
Shadow engines are accompanied by illusory crews of the appropriate number and race. The engines can move at a rate of 20 yards per turn and are unaffected by terrain considerations. (The caster can choose to slow them when passing through rough terrain to aid the illusion of reality.) Shadow engines cannot carry real troops.
They can be fired at the same rate as real engines of the appropriate type, but a hit causes only one-half the damage normal for that type of engine (round fractions down).
A shadow engine remains in existence until the spell duration expires, until an enemy unit approaches within 10 yards, or until it suffers damage from an enemy missile attack. When any of these conditions occur, the engine vanishes. If a single spell has created multiple engines, only the engine struck vanishes; the others remain.
The crew associated with a shadow engine must remain with that engine; it cannot move more than 5 yards away from the engine itself. Shadow engines can move independently of other engines created by the spell as long as they remain within the area of effect and remain within 240 yards of the caster. The caster must maintain concentration to control the shadow engines. He cannot cast any other spells, and he is limited to a movement rate of 6. If the caster is struck for damage, the shadow engines vanish.
The material component is consumed during the casting.

[Tome of Magic]

Sphere: War
(Illusion/Phantasm)
Level: 7

Range: 240 yards
Components: V. S, M
Duration: 8 turns
Casting Time: 3 turns
Area of Effect: 180-yard x 180-yard square
Saving Throw: None

Material Components:
a finely detailed miniature model of a siege engine (of any type)