Kaja's body was torn apart, the wounds inflicted from the explosion of the Heart Dragon artifact he removed wound his entire body. Blood splattered out of his body, if not for the help of the Soul Deep Artifact and also the water of life then his body would definitely not be able to withstand the ill effects of the Heart Dragon.
The living water he got from the end of the world that he had passed through for twenty years and also the Soul Deep artifact that Yonan implanted within him. They were all powerful weapons capable of protecting his body from damage from the energy effects of the Heart Dragon.
Kaja channeled his power and pushed away the negative effects of the Heart Dragon artifact and with that, he was refining it directly with his power. No one has ever done this before, because of course it takes no small amount of strength and again requires lives at stake.
