My attempt at the ultimate Death & Dismemberment table, tweaked for 5E play.
If you aren't familiar with the Death & Dismemberment Table, imagine the Lingering Injuries Table from the DMG, only beefed up to be the sole system for managing what happens when a PC hits zero hit points. No more death saves or death from massive damage, simply roll on the table and face your fate - a surge of adrenaline for a heroic last stand, facial disfigurement, brain injury, dismemberment and death are all possibilities, as is the chance at surviving to fight on or flee.
For more information on Death & Dismemberment tables see my
blog which has a brief history of Death & Dismemberment tables, links to over 40 different Death & Dismemberment Tables on the net and an analysis of the design process for the One Death & Dismemberment Table to Rule Them All