Protective Spirit

Conjuration (Creation)
Level: Hunter * 2, Ranger * 2
Components: V, S, DF
Casting Time: 1 Standard Action
Range: personal
Target: you
Duration: 1 round/level
Saving Throw: -
Spell Resistance: -
  A protective spirit is an Invisible, mindless, shapeless force that hovers about you, defending you against unexpected attacks. When a creature makes an Attack of Opportunity against you, the protective spirit makes an immediate attack using your base attack bonus plus your Dexterity modifier. On a successful hit, the spirit does no damage, but it causes the Attack of Opportunity to automatically miss. A protective spirit can defend against a number of Attacks of Opportunity equal to your Dexterity bonus (minimum 1) per round.
  A protective spirit occupies your space, and moves with you. It cannot be attacked or harmed by physical attacks, but dispel magic, disintegrate, a sphere of annihilation, or a rod of cancellation affects it. A protective spirit's AC against touch attacks is 10 + your Dexterity modifier.