Interpose

From D20advanced

INTERPOSE		General

Once per round, when an ally adjacent to you is targeted by an attack, you can choose to trade places with that ally as a reaction, making you the target of the attack instead. If the attack hits, you suffer the effects normally. If the attack misses you, it also misses your ally. You must declare your intention to trade places with an ally before the attack roll is made. You cannot use Interpose if you lost both of your actions, are flat-footed, or otherwise incapable of taking free actions.

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