Ectoplasmic Armor

Level: Sorc/ Wiz 1
School: Abjuration
Components : V
Casting Time: 1 Action
Range: Touch
Target: Creature Touched
Duration: 1 hour / level
Meta Magic: Still, Silent, Extend, Quicken, Persist

With a final word, a shimmering translucent slime appears around the target and fits its form like a suit of plate.

The subject of the spell gains a +5 armor bonus to AC, with an additional +1 to the bonus for every 4 caster levels you have (maximum +9 at 20th level). This armor bonus only applies against spirits. All other creatures ignore this bonus. ~~(Sprits are defined as Incorperal Undead, Fey, and Elementals)