Star Sealing Runic Cage

"It's not like it matters," Cain muttered under his breath. Without any hint of mercy or ceremony, he sent the unconscious pair of Divine Transformation Masters directly into his Luminous Phoenix Heart.

Intense flames erupted, incinerating the two bodies as if they were nothing more than tinder. Their flesh burned away in a matter of seconds, followed swiftly by the crumbling of their bones. A surge of vitality then coursed through Cain's flesh and blood, focusing especially on his Rebirth Heart. 

As the two Divine Transformation Masters were consumed down to the last speck, Cain felt his Rebirth Heart pulse with renewed strength. However, as the embers faded, he realized there were two things left completely untouched by the Luminous Phoenix flames.

"As I expected," he said softly. "They're not so easy to destroy."