You can choose to gain advantage on all attacks against your target next turn, your target has advantage on their attack rolls against you until the end of your next turn. You feel it is imperative to press the advantage, but maintain awareness of your surroundings. You can choose to gain advantage on all attacks against your target until the end of your next turn, but if you do all enemies have advantage on their attack rolls against you until the end of your next turn. You feel it is imperative to press the advantage no matter the cost.

You feel accomplished, but nothing remarkable happens. This is to prevent the awkward issue where high level heroes of the realm with multiple attack rolls seem to become more incompetent as they level. Optional Rule: Only apply these tables to crits and fumbles that take place on the first attack roll in an action. These effects are meant to be layered ON TOP of the usual critical results. IMPORTANT EDIT: It is worth noting that the regular crit hit and crit miss effects from 5e(extra damage dice or automatically miss respectively) still happen when 20s and 1s are rolled. So without further ado, I present to you my Critical Hit and Critical Fumble Charts for 5th Edition! It should work in most browsers, but if you are running into issues I recommend printing it using google chrome. Last but not least the page the tables are hosted is designed to be print friendly. So far my players who prior to this campaign had never used a crit hit/crit fail table before have had nothing but good things to say about it. There are separate tables for spell crits and spell fumbles as well. Instead there is an emphasis on changing the flow of battle using (typically) short term status effects. The focus of this table isn't effects such as damage multipliers.

It has gone through several rounds of review, and at this point I think it is a fairly polished product. Below is a critical hit and fumble table I created for a 5th edition campaign I have been running.

Dnd 5e best dmg type chart