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PFS StandardReflect Harm Feat 14

Sorcerer 
Source Player Core 2 pg. 156

You can wrap your magic around you like a cloak that causes those who dare to target you with spells to suffer a similar fate. You know the following blood magic effect.
Blood Magic—Reflect Harm Your blood ensures that those who harm you with magic are harmed in return. The first time you take damage from a spell before the beginning of your next turn, attempt spell attack roll against the creature who cast the triggering spell. On a hit, the creature takes the same amount and type of damage that you just took. If you critically hit, the creature takes twice the damage.