User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-16281343-20150718071342/@comment-1359322-20150718110426

Something to add on the Diabolus, all the jewel in the CCQ gains an ∞ mark on it. Also this form was achieved using Great Red's flesh and Ophis' powers, so it seems that Ise has unlocked both Great Red and Ophis' power in one go.

By the way, Ise also has a move for this form, when all form cannons are used in tandem, he unleashes an attack named "Infinity Blaster" (インフィニティ・ブラスター).