Arelith

I do not know if it is possible, but to help make the UD seem more foreign to surfacers (and maybe the surface more foreign to UDers), whenever a surfacer drinks from a natural water source in the UD, he or she is subject to harsher disease and poisons than normal. This is to reflect that surfacers have not adapted to the hostile poisonous cave environment below and should pack plenty of resources.