I like the ideas behind this. We DM's have the ability to adapt and introduce new rules to our games. I could see myself adpating parts of this to fit my style. I might let the player choose between a special result or the extra damage. I realize that this isn't meant to be used on players but I would do something like roll a critical fail of 1, roll again. If you get another 1 your have to roll on the chart of doom! Have fun with this stuff guys!

This doesn't even follow the flow of 5th edition material. The charts are extremely harsh and most effects are impossible to overcome unless you're a high level character with a cleric on hand. The fumble chart contained herein is just plain silly. None of it makes any sense. I am sorry I wasted my dollar on it, and I strongly recommend you don't.