((Feel free to chime into the conversation before entering the portal, but since one of you went in I'm going to assume everyone else follows))
The transition into Ravenloft is much smoother than the one into Sigil. There isn't even a membrane to push through this time, and upon entry, you find yourselves still at ground level.
Small comfort, considering what you find on the other side.
You are on a path - a narrow one, only wide enough for three of you to walk side-by-side. It's made of dirt, and runs through a heavily-wooded area. The trees are all ashy-gray and appear to be dead; not a single leaf grows on any of them. The further off the path you look, the thicker the trees appear, to a point where it would be impossible to move between them.
The path really only extends in one direction. Only about thirty yards behind you, it ends in a short, lonely pier that overlooks a turbulent body of water -
black water. In the other direction, the path continues forward, on and on toward an obscured horizon.
The sky here is pitch black, devoid of any celestial bodies or light sources. In fact, when you think about it, it doesn't make sense that you'd be able to see anything at all - and yet somehow, everything is quite clearly visible.
The air is vaguely chilly, and remains so regardless of how many layers you heap on. It's that feeling where you are just uncomfortable enough that you feel exposed.
There is music playing. ((
yes, your characters are hearing this in-game.))
The haunting melody seems to be coming from everywhere and nowhere all at once; it's not deafening, and other sounds and voices can be heard around it, but it is omnipresent, with no visible (or audible) source. It continues ceaselessly, and seems to have a chilling, supernatural effect on the party....
((Except for Suvne, everyone has -2 to attack rolls, saving throws, and skill checks. This is a continuous magical fear effect.))