Elemental Dial

Ring, rare (requires attunement)

This brass ring features a complex series of contained gears within its casing, allowing its outer shell to spin around an inner mechanism. The outer shell has six runes on it, one for each of the following damage types: acid, cold, fire, lightning, poison, and thunder. While wearing the ring, you can use a bonus action to enchant a weapon you're holding with one of the listed damage types of your choice. The enchantment lasts for 1 hour, until you remove the ring, or until you use this property of the ring again. While enchanted, the weapon deals an extra 1d6 damage of the selected damage type. Once a rune has been used to enchant a weapon in this way, that rune and its corresponding damage type can't be chosen again until the next dawn.

The universe is a series of elemental calculations. In this case, sword, plus fire, equals better.