User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-12.96.67.34-20180630200057/@comment-10330822-20180706051405

It's also worth noting that Issei did that damage with just Ascalon, which is more holy sword than dragon slayer sword, the latter effect is just a bonus. However, Ascalon II is more of a dragon aura/slayer sword than a holy sword, and the fact Issei is a dragon is in part why its so dangerous in his hands, because his Dragon God Aura makes it significantly more damaging, just ask Vidar.

In other words, Ascalon II is more qualified to do more damage to Crom than Ascalon would, since Crom doesn't have a weakness to holy weapons in the first place.

What's more, Issei can summon Ddraig to fight alongside him now and still have the strength needed to defeat Vidar. I feel that says a lot for a future battle with Crom.

Besides, we still aren't sure what this AxA and ExE are. What's more, Ajuka is implying the fusion of Ophis and Lilith unlocks a more complete form of DxD, meaning Issei still has room to grow even now.

When considering all this, isn't it a bit irresponsible to say that Issei "will lose against Crom"? After all, no one would think he stood a chance against Vidar and Typhon, and we saw what happened there.