Used: Sleeping in the rain

I slept in an open field when it was raining with my Cleric and thought it would be cool if she caught a cold from doing which would maybe reduce her con and str and a few stats for a short while, maybe a day.

Interesting idea.

After the next reset, sleeping out in the rain or snow may cause a problem. If you fail a Fortitude save (DC: 12), you'll wake suffering a -2 penalty to your Constitution for up to 8 hours.

In the future, I may add the ability to set up a "camp" that will eliminate this possibility.