yeah, seems like its just the glagolitic alphabet but slightly altered!! it actually tells us on the physical manga covers (from A to U so far) which letter corresponds to which, but i think it'd be easy to figure out just comparing the two
i see what you mean! i personally don't mind too much since this is still very early on in the story and it's only luca's second mission. I think having two dragon deaths back to back would be too demoralizing, and wouldn't really serve as a good lesson either, cause then she'd be getting...