User blog comment:Ixarising/High School DxD Dream Battle/@comment-71.108.89.172-20140215205717/@comment-1359322-20140216015247

Tannin i supposed. Remember what Ddraig said in Volume 5, if Tannin unleashed his full strength, he could easily destroy the territory that Issei and those in the parties were at. If Ddraig was able to give such comment on Tannin's strength i'd say Issei right now isn't at Tannin's level yet.

Maybe Issei should consider training under Tannin and his Dragons again, he could learn some Dragon Lightning and Dragon Blizzard.