Circlet of the Pyromancer

Wondrous item, very rare (requires attunement by a spellcaster)

This golden circlet resembles an outstretched phoenix with a ruby at its center. Its eyes flicker with glimmering embers. You have resistance to fire damage while wearing this circlet. In addition, whenever you roll fire damage, you can reroll one of those damage dice. You must use the new roll.

While wearing the circlet, you can use an action to touch a flammable object that isn't being worn or carried and cause it to ignite.

Charges. The circlet has 10 charges for the following properties. It regains 1d6 + 4 expended charges daily at dawn.

Spells. While wearing the circlet, you can use an action to expend some of its charges to cast one of the following spells from the circlet, using your spell attack bonus and spell save DC: flame blade (2 charges; no concentration required), fireball (3 charges), or wall of fire (4 charges).

Explode. While wearing the circlet, you can expend up to 5 of its charges whenever you deal fire damage (no action required). For 1 charge, the fire damage is increased by 2d8; the damage is increased by an extra 1d8 for each expended charge after the first. A target that takes this fire damage must also succeed on a Dexterity saving throw against your spell save DC or be pushed up to 10 feet away from you for each charge spent.

Phoenix Fire. When a creature that you can see within 60 feet of you takes fire damage, you can use your reaction to expend 1 of the circlet's charges to reduce that fire damage by half. If the creature is holding a weapon, that weapon also becomes engulfed in flames, which are harmless to the creature. The weapon remains lit until the end of the creature's next turn or until it's no longer holding the weapon. For the duration, the weapon sheds bright light in a 20-foot radius and dim light for an additional 20 feet, and it deals an extra 1d8 fire damage to any target it hits.

"To be born from the flames is to be wrought from anguish. To live by the flames is a wish only for death. To die by the flames is proof that you have crossed paths with me."

—Flame King of the Phoenix cult.