User blog comment:B214/Volume 23 discussion blog/@comment-76.175.162.45-20170325062248/@comment-10330822-20170325170701

He's an upper-level of your typical God-Class. He's strong enough where he can wipe out armies of other God-class beings. Both Great Red and Ophis hold the Top 2 spots in the Top 10, so its safe to say Issei's up there with them. Odds are besides Great Red and Ophis, he has no other equal.