Magic Siege Engine

Transmutation
Level: Antipaladin* 2, Artificer * 2, Cleric */Oracle * 2, Inquisitor * 2, Paladin * 2, Sorcerer */Wizard * 2
Components: V, S, DF
Casting Time: 1 Standard Action
Range: touch
Target: one siege engine touched
Duration: 1 minutes/level
Saving Throw: Will negates (harmless, object)
Spell Resistance: yes (harmless, object)
  This spell permits an indirect fire siege engine to bombard its targets with greater accuracy, delivering more damage. The siege weapon receives a +1 Enhancement Bonus on targeting rolls and damage rolls. If used on a direct fire siege weapon, this spell acts a magic weapon.