I dreamed that I was rejoining a magical girl roleplay MUD which I'd previously left. No, not the one waking-me actually did leave, some other one which the dream made up (also they were two completely different server-types). I was still going to play as a villain, though.
There was a mandatory in-universe "system" where in order to transform, you needed to "fuse" with another character; even in the ream, I realized that this would be inconvenient if you didn't have a partner whose schedule perfectly matched with yours 100% of the time.
After rejoining, I discovered in a conversation with the guy in charge of the game that the tone was off -- I forget the exact turn of phrase dreaming-me used, but it was some witticism about being gritty instead of all-cute-all-the-time, but not too gritty. Also, the combat system was this horrendously-complicated grid-based system that was depicted in the dream in a way really didn't make sense for an entirely text-based medium like a MUD.
I awkwardly bowed out of the conversation and left the game again.