When Issei inflated with excessive amounts of kaimei in preparation for a technique that he knew all too well, Granfedyu's pupils gained an atramentous glow. He beckoned his index finger toward Issei and eight black corners instantly connected to create a translucent prism of dark black kaimei.
“Onyx Prism!” He shouted and the detonation that followed was loud and powerful enough to cause major vibrations in the room despite being compacted within the cube. The floor and ceiling rumbled as numerous cracks opened up. Michael and Kyūkyoku were taken aback but barely displayed it on their faces. Granfedyu simply smiled at the pair, glad that they were alive.
“Nyaaah~” he sighed, “That was a close call!”
Michael nodded indifferently and muttered an incoherent, “Thank you.”
“Alright then, you're free to go to school now,” Granfedyu dismissed with two claps of his hands.
“Seh, Granfedyu,” Kyūkyoku said with a subtle bow and took his leave. ( Yes, Chosen One. )