Editing BUILD SHELTER

You build a temporary shelter in order to mitigate adverse environmental effects. 

'''Activity:''' You spend the day building a 10-foot by 10-foot shelter from nearby material that can accommodate one large creature or two medium or small creatures. At the end of the day, attempy a DC20 Survival check. You can't take 20 on this check. 

'''Results:''' On a failure, the shelter lasts for only the following day. On a success, it lasts for a number of days equal to the number by which your result exceeds to check's DC. While the shelter lasts, occupants of the shelter are protected from cold dangers and Heat. This also counts as a shelter for the purpose of Survival checks to endure severe weather and protect its occupants from damage from dust storm and thunderstorm. At the GM discretion, a well-built shelter might also provide other protections.