So, for the ones who have completed the latest DLC for Red Dead,   
 

No I think that John turning into a zombie is the end of it.

I'm at that point in the Undead nightmare DLC and i have been wandering around, managed to save every town on the map, nothing else to do. Unless maybe you are supposed to find seth, cause there was a quick clip of him stealing the mask from the catacombs before Marston rose from his grave. the only thing is, he's not at his usual hideout, I know he was transient during the main story in red dead, but I can't find him and there is no indication as to where he may be on the map.........

Achievements, outfits, challenges but other that I don't think you will be able to anything story wise it's just like being Jack.
 
Also that ending is fucking awesome.

yeah i figured as much, i just checked out the catacombs in Escalera as they are sealed shut, not even dynamite blows it open. I have to say though, riding around on Death is great, especially when zombies come in contact with the horse and their heads explode! Almost as cool as riding War, I like seeing the zombies burn!

  I like seeing the zombies burn!    

The only thing I have yet to try is the online modes. I'll probably try tomorrow at some point after work! 

Nope, it seems that's the end. Doesn't bother me though, free roaming in UN feels very different from the main game. And I want to hunt mythical creatures forever!

agreed

I've actually killed Seth and his little zombie party after completing his quest. Within the context of my personal adventure in RDR:UN, the ending makes no sense at all.
 
Probably there's another ending when one encounters Seth maybe?

I've roamed around, saved all the towns "spinning plates", went to Escalara and tried to gain entry to the tomb with dynamite to see if i could get cues to teh location of the mask, I went looking for Seth in that small shack on the river, he wasn't there; I also looked for seth at coots chapel where i first met him. One thing bothered me about the ending was that when you emerge from teh ground the text narration says that your wife and son buried you with a flask of special water, I find it odd they stressed teh water and assumed it must be the holy water so i also went to Las Hermanas to see if there was a connection to that and an end because that is where you get the water to begin with.
 
I don't knwo why they stressed teh "buried with his water"  because they buried me with everything else; a blunderbuss, tons of dynamite, undead bait, tobacco, moonshine, repeater riffles. Seems strange you would make mention of 1 of the 5 or so thrown weapons available and ignore everything else.   
 
Fking great ending though. I hope GTA 5 has an undead expansion. This brings me back to the old days playing the caramgeddon demo zombies. I really don't care if zombie expansions become a cliche.

" I've roamed around, saved all the towns "spinning plates", went to Escalara and tried to gain entry to the tomb with dynamite to see if i could get cues to teh location of the mask, I went looking for Seth in that small shack on the river, he wasn't there; I also looked for seth at coots chapel where i first met him. One thing bothered me about the ending was that when you emerge from teh ground the text narration says that your wife and son buried you with a flask of special water, I find it odd they stressed teh water and assumed it must be the holy water so i also went to Las Hermanas to see if there was a connection to that and an end because that is where you get the water to begin with.  I don't knwo why they stressed teh "buried with his water"  because they buried me with everything else; a blunderbuss, tons of dynamite, undead bait, tobacco, moonshine, repeater riffles. Seems strange you would make mention of 1 of the 5 or so thrown weapons available and ignore everything else.    Fking great ending though. I hope GTA 5 has an undead expansion. This brings me back to the old days playing the caramgeddon demo zombies. I really don't care if zombie expansions become a cliche. "

Does any one no if there is going to be a red dead undead nightmare 2?

I'm not sure if that's the end or not. All's I know is when you transform into a zombie. Look at your stats and you will see that you are only at 53 or 63%.hopefully there will be a sequel with the answers to our questions.