I'm starting to put together (in my mind at least) and adventure for my group which entails an avalanche as a story item and am not sure how to handle it. The basic premise is this, massive doors high up in the mountains covered in eons of snow and ice, making it impossible to tell doors from just the regular mountainside. The PCs do something (probably will be blowing a horn or ringing a bell or such) causing the snow and ice on the doors to come down, revealing the doors. As my plan is to have those doors be at least 100 feet tall, we're talking huge amounts of snow and ice hurling at my players. I was thinking of using the roof cave in rules for this part, but not sure if that's really the best way to go. Also, since this is primarily a story item, I see the challenge of this finding the doors, and then figuring out how to open them or get around them and am not looking to really injure the players in the process, though I would expect at least 1 or 2 of them would get buried and need to get dug out. I'm just not sure how to make this compelling from a story perspective without being overly lethal from a play perspective.
Suggestions? Thanks.
