Ending Question *SPOILERS*

I took it that at the ending the younger brother ran off with the map and weapons to hunt the other zombie/nazis while the older brother went back to the burnt up farm to study the rune stone and try to claim it's power for himself. I guess if the movie did well enough, and a sequel was made, the brothers would have to face each other someday. That would have been a really good idea for the sequel if it ever got made.

IMO, the ending really didn't make much sense. It is heavily implied that at all the other runestone locations the exact same thing happened, i.e. a Nazi on the rise to become some unstoppable evil force, but then being somehow trapped or otherwise kept from achieving the final steps - else we would have heard about Nazi-zombie-Gods roaming the streets. I find it VERY improbable that the same thing like here happened elsewhere (someone stealing his books, figuring out what is going on and how to trap them with runes, but for some unknown reason keeping feeding them to keep them alive, just not enough to become too powerful).
Chances are, our paramedic-turned-superhero finds some long forgotten farm with exactly nothing going on, or there is now a Walmart parking lot where a runestone was buried, etc.
And yeah, the brother standing at the ruins with the runestone didn't make much sense either. It can't be that he tries to make use of it himself, as all the books are gone, which basically means there is no instruction manual left, and all the others who might have known a bit about it are dead. He himself knew *beep* else he would've known what was really going on, instead he thought they were just a bunch of wackos who were getting off on torturing people.
Dramatic, suggestive shots that make absolutely zero sense in the context of the movie. Also, to repeat the exact same narration as in the beginning was kinda bothersome; first, we haven't accidentally forgotten what was happening, and second - as said above - it's utterly unlikely the same happened elsewhere, so there's no reason to go back to the beginning.

I just rewatched this and have the same confusion about the ending. I totally get the younger brother, Evan, going off and hunting the others, if they are still around. But, the older brother, Vic, I'm at a loss to his motivations, other than he knows that his younger brother will need help and it's not a one man job, because it really shouldn't be. It could be that Evan is trying to find out what is going on in the other areas and if he finds another one, he'll call Vic for back up and Vic is thinking about giving these things more payback.

OTOH, I can see where they tried to make it seem like Vic wanted the immortality but that goes completely against what we know about his character. Unless they are trying to say that he had a major psychotic break after being tortured so long which is very possible. But that would be a shame to do to the man who came back to end it all.

I really hate when movies leave this sort of thing so ambiguous. It leaves me with a very unsatisfied feeling that counters the decent movie I just watched.