Beginning at 14th level, the divine power that fuels your rage allows you to shrug off fatal blows.
While you're raging, having 0 hit points doesn't knock you unconscious. You still must make death saving throws, and you suffer the normal effects of taking damage while at 0 hit points. However, if you would die due to failing death saving throws, you don't die until your rage ends, and you die then only if you still have 0 hit points.
{
"name": "Rage beyond Death",
"page": 11,
"level": 14,
"__prop": "subclassFeature",
"header": 2,
"source": "XGE",
"entries": [
"Beginning at 14th level, the divine power that fuels your rage allows you to shrug off fatal blows.",
"While you're raging, having 0 hit points doesn't knock you {@condition unconscious}. You still must make death saving throws, and you suffer the normal effects of taking damage while at 0 hit points. However, if you would die due to failing death saving throws, you don't die until your rage ends, and you die then only if you still have 0 hit points."
],
"className": "Barbarian",
"classSource": "PHB",
"subclassSource": "XGE",
"subclassShortName": "Zealot"
}