Ectoplasmic Armor

(Libris Mortis: The Book of the Dead, DnD 3.5)

Abjuration

Level: ; Sorcerer/Wizard 1
Components: V
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 1 hour/level (D)

You gain a +5 armor bonus to AC, with an additional +1 to the bonus for every four caster levels you have (maximum +9 bonus at 16th level).
This armor bonus applies only against incorporeal touch attacks.
All other attacks ignore the armor bonus from ectoplasmic armor.