Death Isn't The End

you gain the following benefits:

• your constitution score increases by 1, to a maximum of 20.
• once between long rests, when you take damage that reduced you to 0 hp, but does not kill you outright, you can instead drop to 1 hp.
• when you fail all 3 death saves and would die, you can make a DC 16 constitution saving throw. on a success, you can take a turn, with an advantage on all attack roll. at the end of this turn, you die.