This is a problem as old as the game: How does a DM get the players to stop just outright slaying all NPCs, but more specifically the "good guys".
<snip>
After the slaughter fest, the PCs flee the city and go to hide in some caves. And this ends the adventure for the night. Of course, next game brings up the problem: what will the city do about the most vile and evil mass murderers in all of history. Sure you could just ignore it. But most DMs like to have a bit more 'reality based games' where consequences matter.
I sent the game notes to the games DM, and he was a bit shocked the players did the murderfest. There is a chance, he said, he might need me to cover the game next week. So that puts it back to me of what might happen. My reaction would be the super harsh way...killing the characters. And maybe reseting the game with some time travel or something like that.
But this leaves the issue of talking to the players. I'm not really a fan of talking. They think they did nothing wrong by slaughtering so many NPCs, but then still "get" that they had to flee the city as they are now mass murderers. I know from many past "talks" that nothing much will come from such a talk. I'm sure the players will say "anything in the game that gets in my characters way will be slaughtered!!!!!!", as that is exactly what they did.
But....here I am. Asking for maybe another view point? Is there anything new to say on this topic?