[Lady_Bernkastel]

Spoiler for Thoughts and theory about Battler's sin:

There are two Battlers. Beato said that the true Battler was already dead six years ago.
Maybe the Battler we know (the fake one) killed the true Battler somehow six years ago, and then got his name and replaced him as Asumu and Rudolf's son. That's why the true one was already dead back then...
There's a possibility that Beato and the true Battler had some kind of connection...Love or something (Maybe the Battler that appears with long-haired-Beato in that field in the end of the op is the real one, and this is the past or something).
Then, by killing that Battler he hurt Beato.
Well...that's just something that I thought...There are some problems with this theory because....well, why would this affect or cause the deaths on the island?