User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-31.11.130.118-20171221162440/@comment-2A02:8109:10BF:B444:0:0:0:2-20171222080404

ExE is the Power of Great Red

AxA is said Issei`s true Power, a Power that could change the World, a Power from a Being Born from Great Red and Ophis, you could say this is Issei`s inherited Power from his "Second Parents" like the Power of Destruction is inherited by Baels and Sirzechs, Rias, Millacas and Ex.