Energy Siege Shot, Greater

Transmutation
Level: Sorcerer */Wizard * 6, Summoner * 6
Components: V, S, M (a ball of pitch)
Casting Time: 10 minutes
Range: close (25 ft. + 5 ft./2 levels)
Target: one siege engine of any size
Duration: 10 minute/level
Saving Throw: Fortitude negates (harmless, object)
Spell Resistance: yes (harmless/object)

This spell functions like energy shot, except it can target siege engines of any size, not just Large siege engines.