I def don't think the dragons are going to be kill able with strictly physical effects based on their descriptions. Pretty sure it will require some esoteric sealing bs
Skyslicers are a purely physical effect, they killed one just fine. Maybe the most normal looking one. But I bet an EM nuke would get at least some of the remaining ones.
I think it's somewhere in the middle between 'physical effects' and 'esoteric sealing'. We know that the Archaeopteryx could, for the weakest dragons, kill them with raw ordinary firepower. Eventually they escalated to the point where only the Archaeopteryx King's special brand of hax could do any lasting damage, and the clan fell before that stopped being truly effective.
But it's worth noting that Shisoberin's special brand of hax was gravity control, manipulation of an eminently physical effect. Certainly at a high power tier, but still physical. Same with our skyslicers, which "only" produce extreme cutting forces stronger than the hide of these dragons.
The ooze dragon is the most concerning of the bunch, because it looks like it might survive being sliced to pieces as long as those pieces can merge back together again, but the other four remaining dragons probably share the same weakness to skyslicers. Of course, that only helps if we can hit them with it, but with Conjura on our side that doesn't seem impossible. Set up some nets in predetermined locations, and help Conjura line up a space-time ninjutsu that sends them careening into one of the death planes. The last one, the ooze dragon, we could probably handle with sheer massed force by the Bosses of the Crusade, but if that's insufficient we could try to have Conjura yeet it into the middle of an EM nuke and see if that finishes it off.
Of course, all bets are off if more dragons come after that, but the hard part right now seems to be getting past the esoteric effects the Dragons are using, like the fall of night or the ethereal beauty. We need to still be able to wage war on them despite those qualities.
...I wonder if we can create a visor seal, that takes in pure light (and
only light, deliberately purging anything hitching a ride with it) and recreating the image on the other side. This could maybe allow us and our great warriors to gaze upon the sight-based Dragons without triggering their effects.