User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-2607:FB90:2270:C313:35E6:D435:1799:3A37-20190610053646/@comment-10330822-20190620010737

Before his fight with Vidar, Ddraig assessed Issei at being Satan-Class in his Balance Breaker and Super Devil-level in his Crimson Cardinal Promotion. He is God-level in his DxD Form, but its not confirmed if he is stronger than Heavenly Dragon-Class yet, as the DxD Form wasn't necessarily stronger, Issei could just last longer in the form, and was strong enough to be Vidar, the Chief Norse God with a strength level on par with the Top 10.