We don't specifically have a plan for poison at the moment. There are certain other ones that we have bigger plans for, and they are the ones that needed the combat updates to implement. We started with Poison/Regen because they were easy to implement and let us test our initial code, which is when we found the weaknesses that would be problematic for the other effects. We will probably add some enemies, likely a boss, that has high defenses where something like Poison will be the best way to deal with them, but nothing is set yet for that.