AaronJer said: The whole point of the story is that the players didn't want to have any idea what or who might be a bad guy or menace of some sort. They wanted a mystery, not a "There is a big problem/dragon/treasure, go fix/slay/steal it.". I see now that, in the reverse, this makes them think a devil *might* be a good guy. Basically, I've just decided to let the consequences play out. I've made it very clear that the public finding out they are associating with a devil would be drastically bad, even if the devil itself doesn't drag them into Hell. It was incredibly funny every other time they did something like this. For example, they rendered their one silver weapon useless (through no prompt of mine whatsoever, mind you) right before confronting a vampire, and the characters (not the players) were absolutely furious with each other, that was a good laugh. Mouse said: I would just go with what kind of chracter you had in mind for the Devil NPC (does he have use for minions, does he maybe give them something as thanks since he is lawful and then go on his merry way destroying stuff, etc.) That's just it, I didn't have anything in mind. The party contains mostly good characters and paladins and stuff. I am completely flabbergasted that they're even talking to it. They basically encountered the aftermath of a battle between vampires and devils, the intention was to investigate the scene, not revive the losers. I managed to wing it and make it look intentional, but when the session was over I was all "Oh, sweet Jesus, where do I go with this?!", but now I have an idea. The funniest thing about it is that the devil is terrible at lying, and it made up a really, really stupid story as to why they shouldn't kill it, and they just totally believed it even though it's very obviously just making shit up to avoid getting killed while it is disarmed, has around 1 hit point, and is completely surrounded. The only saving grace for the players is that it is just a soldier, and very bad at scheming. At least I can imagine the paladin's deity facepalming as hard as I am. Since you are making a game where things are more ambiguous than the typical D&D world this actually isn't that wild+crazy. If they did this in a standard setting, it would be pretty ridiculous, but since part of the assumption is based on them not knowing what is evil and what isn't it actually makes sense that they would talk to it. If I was playing a CN rogue type, I might just kill the devil to be safe, but a LG hero might not want to risk murdering an innocent even if it puts them at risk. This is just an example of PCs making decisions based on limited information (which is what they want to do based on your posts). Sometimes making decisions that won't turn out well is part of that style of game. In the context of the quoted post the actions aren't as unreasonable as when I read it in the original post (they are aware that they are supposed to ask for sense motive right?). Of course, whether or not you think the decisions are good or bad are completely irrelevant to how to referee a game. You only have to decide how the world and its denizens react to it. Now getting back to the specific question of how to handle it. I hardly think this is a campaign ender. I can't help but thing you are conflating demons and devils. If you are playing with standard Pathfinder devils it actually should avoid trying to kill the characters. While demons will tend to try to slay and destroy things, devils usually try to twist and corrupt good creatures in order to serve hell. It would be more likely to try to betray and kill the party had they trusted a demon, but since it is a devil it could actually be very cool. The devil should be trying to corrupt the characters and turning them into agents of hell rather than just killing them (or introducing them to a more manipulative devil if it is just a simple soldier of hell). Since you are running a more ambiguous game you could even toy with the idea of them turning the devil to good, or at least using its strength for good by manipulating it. Devils are one of my favorite villain archetypes for the reason that their goals are usually more complicated than "kill the PCs." Regarding how to make the NPC. Start with the vanilla devil personality and customize it. It sounds like you already have somewhat of a personality for it (big stupid fighter type). If you are feeling particularly uninspired you can use a table to generate personality types.