User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-12.96.67.34-20180630200057/@comment-34061653-20180703211739

People saying Ascalon will not work on Crom but forget the fact that in volume 16, Issei was able to blow off one of Crom's wings because of Ascalon and this was before he had "Penetrate". I can see Issei having a easier time against than Vali (who was basically fighting on the defensive) because of compatability. Crom fights similar to Issei which is basically going to be a fight similar to Issei vs Sairaorg. Crom has an edge but that gap can be closed thanks to his abilities and 2 dragon slayers. Having 2 dragon slayers+Boost+Penetrate and they would do more damage to Crom than Vali's demonic blast.