Wistle, this is some gooooooood shit.

maybe give her a dragonbone dagger? not a artifact but a good weapon but not as powerful as a sword and yet being dragonbone very few things could break it maybe give it a blessed enchantment basically a much weaker effect of dawnbreaker or a permant the moon enchantment

another great chapter

Youve got my attention!
I dig your Last Dragonborn, I believe you can get away with references to game mechanics (the hit points another reviewer mentioned) if you do it via him and not Asia (those being part of Tamrielic culture), in the style of "No Need for Halkeginian Logic" if you know this fic.

IMO Asia would ask to learn healing spells from him, or would she consider it heretical since it is "magic"?

OMG, will it be a "Kiritsugu Emiya" Asia. kill everyone on the boat to ensure that the target won't escape.

Two minor nitpicks

the few times you referenced hit points broke immersion for me, I think saying something like she felt herself get weaker or fainter would be better.

I feel that it would be best for Asia and Issei to have a sibling-like relationship than any kind of pairing, although depending on how you write him it could be fine either way.

All in all I hope to see more.

damn best new story ive read in awhile double favourite this is

Just imagine you're some random demon or angel fighting a human, then suddenly he decided to summon a fucking dragon to kill you.