User blog comment:Miskos3/Fairy Tail 514: Dragon Seed, Review/@comment-24784846-20161213010900/@comment-4829046-20161214200002

@Delta No, FT doesn't kill if they can avoid it still applies whenever 'human' or 'human-like' characters are involved. Ikaruga and her guild-mates died (in the manga version) because the tower collapsed. Azuma died because the lost magic kicked in as backlash. Erza did not want either to die. Even with Demons, they mostly did the same nonlethal attacks they always do,(remember Kyouka? It was Minerva that fatally stabbed her) but the system was such that they would dematerialize in order to revive again. Just so happens that their revival method was destroyed, thus putting an end to their immortality. It was unavoidable.

With pure 'monsters' it is different though, as we've seen with certain animal foes and lesser demons. However, that's part of the 'fantasy' genre where unless explicitly mentioned, monsters are meant to be killed. Acnologia's dragon form certainly qualifies as monster(similar to Motherglare's dragon spawn), but his base form will still register as a human. We do not know how exactly it works but I think FT will still have some trouble with the idea of killing the last dragon unless Irene has some alternate suggestion or one of them decides to mess with time.