Every day in the wilderness/cavern whatever all characters have to make 1d4 saving throws vs. taking a really, really, really inconvenient shit. There is no limit to how many days in a row this can be a problem. PC's can opt to hold the shit in, which leads to another saving throw- against 'roids. failure leads to 1d3 piles, -25% of movement rate for each one and -1 on all combat rolls for each one as well. These piles will take 2d4 days to subside, during this time the character must make hourly saving throws. A failed ST results in uncontrollable weeping- at both ends. .