Koga's first original jutsu, the Sage Art: Wind Release: Rasenrengan is simply two Wind Release: Rasengan used simultaneously. Once created, both wind Rasengan's are used at the same time with greater force than a single, regular Wind Release: Rasengan. Due to their wind nature, the jutsu can shred a target with little issue. The technique requires natural energy, because outside of Sage Mode Koga can only make one wind Rasengan at a time.