Hit points go no lower than 0

@JeremyECrawford @SageAdviceDnD does relentless endurance (halforc) works when you get to exactly 0 HP or getting to negative HP also works?

— Diego Luna Vera Tude (@dlunavt) December 9, 2015

Hit points go no lower than 0. #DnD https://t.co/AeAzj3tOo1

— Jeremy Crawford (@JeremyECrawford) December 9, 2015