Avernus Boon of Zariel

Once per Long rest, if you drop to 0 health points with your Radiant Consumption still on, your flames consume your flesh until only a flaming skeleton remains. While in this form, you gain the following benefits:

• You gain 25 temporary hit points.
• You can use your action to exhale destructive energy up to 5 times. When you use your breath weapon, each creature in a 15 ft. cone must make a dexterity saving throw. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus. A creature takes 2d6 fire damage on a failed save, and half as much damage on a successful one. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level.
• Your Radiant Consumption is paused and resumed when this Form ends (meaning when you are healed, choose to end it or your temp HP are depleted). However, in the meantime you retain the burning aura of your Radiant Consumption, except you don't take the damage yourself and the damage type is now fire, not radiant.

After one minute, when your temp HP are depleted, or when you choose to extinguish your flames (no action required), you fall unconscious and revert to your normal form if your aura is still on and start rolling Death Saves as normal.

You return to normal if your HP are restored at any point, losing access to any features described above that came with the form.