User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-1359322-20140108062741/@comment-1359322-20140108065302

Ishibumi only used them as reference, he doesn't based on the real one.

As to the weapon to defeat Crom Cruach i think we can eliminate that since Crom Cruach was never killed, well even if the weapon exist, it might not be effective against Crom Cruach anymore, he doesn't seem like a fool to not overcome his weakness after many years of training