Re: Help GMing travel through a mountain pass...
First off don't let the guide be taken by an avalanche, if there is one thing any guide or any other local knows it is how to avoid them. Let a monster take him instead.
After the guide is disposed of then you can lead them into an avalanche. But remember! Avalanches are deadly atleast 6d6 normal for the outskirts maybe ten to twelve for in the middle. And unless they are really lucky they will be buried in the snow and then you die if not someone dig you out. I suggest that you let them have plenty of warning and that you let them see the enormous avalanche coming down the mountain miles away so they have a chance to run. Let them make con rolls to see if they can keep up the tempo. Maybe the avalanche is triggered by one ogre and his henchgoblins? So they can attack anyone who did not get taken by the avalanche and dig up and eat the rest later. When it comes to the cold you are right that most of the adventurers should be capable of surviving in the wintermontain let them have some survival rolls, give those who does not make them a couple of minuses to cv. Putting this together you have the Kislevite get up from the avalanche, he sees his sword lying a couple of meters from him, he reaches for it the same second he hears the screams of the approaching goblins, he is frozen and can barley move and just as he has crawled close enough to reach for the sword an huge shadow block's out the sun while an furclad foot the size of an mans torso descends on the sword.
So he has to get the sword kill the ogre, kill/chase off the goblins and find and dig up his friends before they suffocate. While frozen. And hurt.
All in a days work for a heroic son of Kiselev.