An Ugly Wake-up
You were sleeping soundly in the village where you stayed, but when you woke up, it was all bleak, dark and ominous. You could hear it, smell it, and feel it in your bones. When you looked or went out, you realized you were not in your home plane any more.
What's more, hundreds of dark-clad warriors are all around, watching you and others confront reality. They have a pallid grey complection, many of them are decorated (or marked?) with tattoos, and almost all of them have some strange or exotic military gear, whether it's a weapon, a shield or a piece of armor. They don't seem aggressive, there are no drawn weapons or attacking spells in casting, but they emanate an alien aura, staring at you with cold calculation in their eyes.
Some of the local common folk who are obviously from the different places you are from are already out, with alarm in their eyes and searching for an escape route, or the village / town guard maybe. A few nosy and intrepid kids are near the 'welcome' party, asking if they can touch their weapons, or whether they can turn someone into a frog. This is probably connected to some parents nearby frantically calling out kids' nicknames, but it has no effect against the curiosity of the young ones.
As you try to comprehend what this means and where you are, a gray-green clad mystic walks up the street to greet you. He has abstract tattoos all over his face, which strangely fit together into a pattern that's both otherworldly and primitive somehow. He addresses everyone present, sweeping around with his scrutinizing look.
"You are now in Dratreme, our village in the Shadowfell. If you wish to return to your homes, listen to what we have to say."