Baby is Cold Outside: environmental damage in CoC 7e?

[GothmogIV]

Greetings. I am writing a scenario for Down Darker Trails. I want the PCs to be stuck in a blizzard. Any thoughts on how to make environmental damage work, like long term exposure to cold and wind? Someone told me Children of Fear has that mechanic, but I'm not dropping $30 to look at  one page! I was thinking CON save rolls at increasing levels of difficulty as the days go by. 

[Grimmshade]

There are some hypothermia rules in Malleus Monstrorum. (Under Gnoph-Keh)

Edited February 1, 2021 by Grimmshade

[Grimmshade]

If you wanted something simple without buying a new book, I'd just make CON rolls and then use the other damage table. Don't allow natural healing of this damage until the characters warm up. Maybe a second failed CON roll gives the equivalent of a Major Wound, depending on how cold it is. 

You could give Bonus or Penalty dice to the CON roll depending on shelter found, clothing, previous failed rolls, etc.

Edited February 1, 2021 by Grimmshade