Unbreakable Construct

Abjuration
Level: Sorcerer */Wizard * 5
Components: V, S, M (powdered adamantine worth 100 gp)
Casting Time: 1 Standard Action
Range: close (25 ft. + 5 ft./2 levels)
Target: one construct
Duration: 1 round/level
Saving Throw: Will negates (harmless)
Spell Resistance: no
  This spell increases the target's DR/Adamantine by 5 or its Hardness by 5. If the target does not have DR/Adamantine or Hardness, this spell has no effect.