Just an Idea. How about being able to purchase a campsite that lasts for approx. the duration of one rest and acts as a safe rest area for all those in the area of effect? It comes complete with tents and a campfire and lasts as long as the person who purchased it stays in it or until they next rest. Maybe it allows a slow regeneration of hitpoints over a set amount of time depending on the quality of the camp. The camp could require a certain amount of time to pass before it is re-made too.
Obviously it can only be used outside, and re-spawning monsters will attack if they see it. The camp could even be a craftable item provided the builder has the skill and resources to make it. Possibly even a portable home that can be used to store items, but which may also be destroyed.