Amulet of the Phoenix

This golden amulet, adorned with an image of a phoenix in flight, is hot to the touch, as are you while it rests around your neck. While you wear it, you are immune to fire and cold damage, and you can cast the produce flame cantrip at will.

Fiery Rebirth. When you would fail a death saving throw while wearing this amulet, you can instead leap back to life in a burst of flame. All creatures within 10 feet of you must make a DC 19 Dexterity saving throw, taking 4d6 fire damage on a failed save, or half as much on a success. You return to consciousness, and you can stand up if you were prone. For 1 hour after rising in this way, your hit point maximum is halved, and you have disadvantage on ability checks, attack rolls, and saving throws that use Strength or Constitution. Once you use this feature of the amulet, you can't use it again until 7 days have passed.

Notes: Immunity: Fire, Immunity: Cold, Healing, Buff, Warding, Necklace, Jewelry, Headwear