User blog comment:B214/High School DxD EX/@comment-201.214.186.100-20170127042731/@comment-10330822-20170414024238

To be honest, Super Devils are among God-Class, probably in Top 10 depending on power. However, Issei's probably one of the strongest beings in existence, beyond Super Devil-Class. My guess is that he might rival Ophis and Shiva by this point.