Source: Explorer's Guide to Wildemount
Wondrous item, very rare (requires attunement)
This onyx sphere bears deep, spiraling grooves and dangles from an iron chain. While the orb is on your person, you gain the following benefits:
Curse. The orb is cursed, and becoming attuned to it extends the curse to you. As long as you remain cursed, you are unwilling to part with the orb, keeping it on your person at all times. All nonmagical flames within 30 feet of you automatically extinguish, and fire damage dealt by you is halved.