I have a biiiiig spoiler, I'm reading the official french translation and...
[spoiler]
in chapter 39 they kill Undine (the water one)... TT^TT (they call it ondin on the french tranlation)
I don't know if they'll be able to revive her but she dies.
[spoiler]
I really liked it and most of the comments are so negative that I kinda felt childish for a moment because of how much I like it... But anyways, after reminiscing the emotions I felt while reading this I can proudly say that throughly enjoyed it. :3