Shadowform

Illusion (Shadow) [shadow]
Level: Antipaladin* 4, Artificer * 4, Bard * 4, Sorcerer */Wizard * 4, Warlock * 4
Components: V, S
Casting Time: 1 Standard Action
Range: touch
Target: creature touched
Duration: 1 round/level (D)
Saving Throw: Will negates, see text
Spell Resistance: yes
  You replace the target's body with mystic shadow material drawn from the Shadow Plane, rendering the target's physical form only quasi-real. Whenever a foe tries to directly attack the target of the spell (for instance, with a weapon or a targeted spell), that foe must attempt a Will Save to disbelieve. If successful, the opponent can attack the target normally and is unaffected by shadowform for 1 round. If the foe fails, the target takes only one-fifth the normal amount of damage from the foe's successful attack or effect, and if the attack has a special effect other than damage, that effect is one-fifth as strong as normal (if applicable) or only 20% as likely to occur. Objects automatically succeed at their Will saves against this spell.