User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-31.11.130.106-20180221213730

Considering Ise will fight with 2 chief of Gods and Typhon (7th place on top 10 strngest beings and on par with Prime Fenrir) he must unlock AxA in the next volume without it he will have tough time against them since his DxD is not perfected. Furthemore if we suppose Ise will fight againt Black Devil King Team he should've unlock ExE - combined power of Two Superior Dragons- to fight Devil able to take on Dragon God, so the volume with their fight will be volume showing that power.