Genie's blood

You have been infused with a shard of a genie's power, and gain the following benefits:

You gain resistance to a damage type associated with one of the genies, and your physical appearance is altered slightly. (Ex. If you chose Djinni your hair could billow in nonexistent wind or stands on end due to electricity.) 

You gain an ability where when you get hit with an attack, you can use your reaction to unleash your elemental power back at the attacker, who must succeed on a DEX save or take elemental damage and be afflicted with a minor negative condition.