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EDIT FROM SONIC!
Users: Silver, Sonic, Shadow
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Name of Skill: Double Kekkei Genkai Sharingan
What it does: attacks the opponents and leaving one energy left
Magic Cost: 20 of remaining MP
History: The kekei Genkai sharingan is passed though the Uchiha family (If you watch naruto, you would know that). Silver, Shadow, and Sonic have this ability because they also have a family relation with the Uchihas. When in the Tsukuyomi world, Itachi and Kisame fought against Sonic and Silver for the chance to escape from the horrible place (Read Lake hylia, a movie II). Itachi explains that both Silver and Sonic had the Family relation. Silver began to explode with so much rage that and the rage passed to sonic the it triggers the Sharingan to happen, Silver's being light blue in the background and Sonic's being dark blue. the two started moving at super high speed and kept attacking Itachi and kisame at all directions with all their techniques. It freed all the victims of itachi( including the ones that were unconscious)