[RPG] Can a Zealot Barbarian at 0 hp be disintegrated

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A Zealot Barbarian gets the feature Rage beyond Death at Level 14 which reads

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.

My question is, if a Zealot Barbarian is already a 0 hit points and gets hit by a Disintegrate Spell, does it turn him to dust? Since the Disintegrate spell reads

A creature targeted by this spell must make a Dexterity saving throw. On a failed save, the target takes 10d6+40 force damage. If this damage reduces the target to 0 hit points, it is disintegrated.

Since the Barbarian is already a 0 hit points his hit points aren't being reduced to 0 hit points. Does that mean the Spell won't disintegrate the Barbarian or is my reading of the Spell incorrect?

Best Answer

RAW: the barbarian will be disintegrated

The rules now say this explictly per the 2018 PHB errata to close what was previously a loophole.

The target is disintegrated if this damage leaves it with 0 hit points.

Since, the barbarian would be at 0 HP after taking the disintegrate damage they would be disintegrated.

The loophole was never intended

Jeremy Crawford, lead rules designer for 5e, confirms this loophole while also confirming that it was unintentional in this tweet (made before the 2018 errata):

The disintegrate spell has a loophole in it. RAI: The spell disintegrates you whether it deals damage to you when you're at 0 hit points or it reduces you to 0 hit points. RAW: You aren't disintegrated if the spell deals damage to you when you're already at 0 hit points.