A torrent of flame passed through the Tear, burning every single Malice that tried to cross. They burned without leaving anything behind.
It was the first time Kai unleashed the full might of Phoenix fire, as there was nothing to stop him in the sky. But he was still pleasantly surprised by the power to burn anything with just a touch. Even the black shadow wasn't spared and turned into black smoke in less than a second.
Still, he felt the immediate effect. He could somehow feel Amber's Spirit Power reserve decrease slightly. It was just as Amber explained. When they were fused, Amber's Spirit Power would be used first to fuel the Phoenix fire and any technique Kai unleashed.
That was why he never felt tired, and the Phoenix girl needed to replenish her Spirit Power every time they fused. It didn't even cost 1% of her reserve, but it was still a big number nonetheless.