So a question arose in my last session, does drain stack? After critically failing against a poison that inflicts the drained condition and damage does a succesful save that lowers the poison stage does the drain level increase stay at the current level or decrease? Essentially does drain effectively stack or does it just use the highest value similiar to persistamt damage?
Pretty sure the answer is no. The general rules are that conditions don't stack and you use the highest value. Plus I think there are some afflictions which specifically say they increase the drained value. If they need to specifically say they stack it suggests they normally don't.