lost magic

Iam interesting to find details if there is someone who can explain this. Iam very curious why these types of magic seems like the ones is the opposite of the other i mean when i 1rst saw that grimmoire heart guy Zancrof uses his god-slayer magic it looked to me like the Dark-side of...

I have been thinking about this for a while; why did the dragons teach a bunch of kids the dragon slaying magic? On a first impression it would seem kind of dumb for a dragon to teach someone the magic that would be specifically serves the purpose of killing dragons. Another thing I find...