Using Relentless Rage after Rage Beyond Death?

Question

Can a Zealot Barbarian use Rage Beyond Death, kill all the enemies (while at 0 HP) and then use Relentless Rage (or Relentless Endurance) to go back to 1 HP and thus avoid death?

Answer 1

This does not work

Both Relentless Endurance and Relentless Rage include the following bits:

[...] If you drop to 0 hit points [...]

[...] When you are reduced to 0 hit points [...]

These are both features that activate precisely when you hit 0 HP, thus, when you would first fall to 0 HP you can choose to use these features instead of dropping to 0 HP. If you choose not to use them, taking damage while at 0 HP does not cause you to then drop back to 0 or be reduced again to 0 and thus does not allow you to use these features. These features both only activate when going from a positive number of hit points down to zero and thus cannot activate during Rage Beyond Death.

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This is similar to the following question:

• What happens when you cast Death Ward on a raging level 14 Zealot Barbarian who is at 0 HP?

It asks about death ward which states, similar to Relentless Rage and Relentless Endurance:

[...] The first time the target would drop to 0 hit points as a result of taking damage, the target instead drops to 1 hit point [...]

The answers there explain that this effect is not triggered by taking damage while already at 0 HP:

[...] The first trigger only kicks in when the barbarian takes damage that would drop them to 0 hit points for the first time. Since they are already at 0 hit points [...] this trigger does not occur at any point during Rage Beyond Death [...]

[...] If they're at 0 hp, and they would take damage, they instead gain a failed death saving throw. Death Ward doesn't prevent that; it would only stop damage from reducing the creature to 0 hp. [...]