The Moss Covered Pylon
For those of you that have access to the 2nd edition Covenant’s book, the description of Val-Negra includes this strange thing referred to as a “Moss Covered Pylonâ€. I’m not exactly sure what that means, but I do know that there are two contradictory descriptions of it in there (that’s the old Ars Magica curse for ya there
). I reconciled it like this.
Originally, when still in the mundane realm, the only way to get to Val-Negra was to access this magical gorge via this Moss Covered Pylon. From there, you would travel seven hours to get to Val Negra, and the village was a rest stop just outside of the covenant. Perdut was always a lost village of sorts, but at least it was part of the terrestrial sphere still.
Now things have changed, and you still don’t know why. Now the pylon is gone, and the gorge is full of monsters and dotted with strange regios. Instead, the magical Pylon is here in Perdut, on the edge of town overlooking a mist filled valley. You are supposed to sleep on the Pylon, experience terrible nightmares, and when you wake up you can travel effortlessly to Val-Negra.
Or you can do it the hard way and just go into the valley and see what happens 
Going the Hard Way means using Second Sight (though you can later invent special Intellego spells to do this). The Mists of the valley is actually a Mentem Vestige (level 6), representing dreams and nightmares (of one dream or of many dreamers?). So whomever wishes to be the guide needs to roll a stress die + Perception + Second Sight + (1/5 Mentem, rounded down), against an ease factor of 12 ( (10 – Vestige Level) x 3), minus the Familiarity Modifier. You all have heard of the place and know it’s name, so your modifier is 1 (ease factor 11). Ludo has been there, so his modifier is 6 (ease factor 6).
Sounds easy enough, but it is risky. If fall short on the roll by a single point, you are lost in the Twilight Void for all of eternity. That would suck. If you botch it is even worse. A low successful roll could be a journey that takes years, medium rolls a moderate amount of time, and high rolls can get you there in a day or mere moments.
The easy way is to sleep here and suffer the nightmares. The old man tells you that when you awake, you will be on the other side of the valley and will see the towers of the covenant. It is wisest to do it this way, but you can use the mists later to travel to other places if you dare.