I Dont Have Enough Friends For This - Tumblr Posts
Probably impossible DnD campaign idea!
Step one! Have two groups of players. Play with both of them in the exact same setting, but each group is in different kingdom that are in not good terms with each other.
Now. Don't tell them that they are playing in the same world. Preferably, don't show them any maps of the other kingdom, in case both groups know each other, because then they might figure out what you're doing!
The next step is introducing a group of ''villains'' from the other kingdom, who in reality are the other group of players. You can have players hear an NPC talking about "these horrifying bandits from another kingdom''
If players decide to find the ''villains'' you can just say that they escaped before the party came. You will play with both groups at different times probably anyway, so it's not a lie to be honest.
Now find a perfect moment to invite both groups to play at the same time. When they are confused about what the other people are doing there, reveal that there never was a group of villains, only a group of heroes from both kingdoms!
So what were the NPCs talking about? Well, there were no NPCs in the first place! It was a shapeshifting BBEG, who was pitting heroes against each other in hopes that they would destroy each other and won't be able to stop him!
The chances of pulling that off are slim, not gonna lie... But if you were to be successful, it would be epic!!! In my opinion at least...