Compel Hostility

Enchantment (Compulsion) [mind-affecting]
Level: Artificer * 1, Bard * 1, Cleric */Oracle * 1, Hunter * 1, Inquisitor * 1, Paladin * 1, Ranger * 1, Summoner * 1, Warlock * 1
Components: V, S, M (a drop of your blood)
Casting Time: 1 Standard Action
Range: personal
Target: you
Duration: 1 round/level
Saving Throw: see text
Spell Resistance: see text
  Whenever a creature you can see that threatens you makes an attack against one of your allies, as an Immediate Action, you can compel that creature to attack you instead. When you compel a creature to attack you, you must first overcome that creature's spell resistance, and the creature can attempt a Will saving throw to ignore the Compulsion.
  A summoner casting this spell can choose his eidolon as the target of the spell.