What Rain was doing was simple, he was using the water mirror technique alongside all the energy that he had obtained from the dragons themselves. That was why he could almost fool them completely. It was amazing and insane, but every time he killed a dragon, his body and energy were almost completely restored… such was the power of the ominous sword.
The dragons raised their guards by looking around and getting close to each other, but in the end, Rain was still able to surprise one of them with a full downward swing and cleave the beast in half. Still, that caused something else… the final three dragons self-destructed at the same time.
