Lingering Injuries and Wounds, Massive Damage; Variant optional rule D&D 5th Edition

In the DMG, there are rules which you could use if you wish to implement sustained injuries and wounds for your players (pg. 272) and while I like the idea the random table presented there doesn't really fit my ideas about such wounds and injuries. This is a table and rule I made for my home groups, I hope you like it. Feel free to use this in your own games, and if you do, tell me how it went.

Non-combat damage, Coup de grâce, Instant Death; Variant rule

In 5th Edition hitpoints are defined as combat stamina and luck. A character doesn't get healthier by gaining levels, he just gets more accostumed to fighting and pain, and more experienced at avoiding lethal blows. This is why a character can "heal" overnight from 1 hitpoint, and this is why short rests make sense. Hitpoints do not represent actual physical health and well being, and for this reason hitpoints only make sense in combat situations. With these variant rules, you can implement a more realistic (and grittier) way of treating non-combat damage.