Ring of Magic Potency

This ring made entirely of obsidian emits a faint magical aura. When a wearer of magic equips it, the ring glows slightly with with a red light.

Wondrous Item (Uncommon)

Requires Attunement

Whenever you cast a 3rd level spell or lower, you can use this ring to channel you magic through it. If you do so, you cast the selected spell without expending a Spell Slot.

You can use this effect once per long rest.