This is an excellent series of critical hit and fumble tables. It maintains the simplicity that is the hallmark of 5E, while adding a level of depth that the core critical hit rule is lacking. Unlike many other critical hit systems. which seem to break the rules of the game, it also easily integrates the core Advantage/Disadvantage system of 5E to great advantage and thus can be added seamlessly to pretty much any campaign.

I also like how balanced the results of the table are, such that the player can actually choose the critical hit, both enhancing the player's agency in her combat resolution and allowing for situational-based criticals (rather than often odd and misplaced critical results).

Five stars!