Ring of Invisibility

A Ring of Invisibility is a legendary item that permits the wearer to become invisible.

Appearance
The ring Vox Machina found had interwoven gold and platinum bands.

Properties
The ring requires attunement. An attuned wearer can use the ring to turn invisible as an action. Wearing a Ring of Invisibility, they become visible again when they attack, cast a spell, or use a bonus action to become visible, but there are no limitations on the uses per day. A Ring of Greater Invisibility has the same properties but actions do not break the spell.

History
Vox Machina found a Ring of Invisibility in Vorugal's horde after defeating him. Vax'ildan ultimately took the ring and first attuned to it when the party was in the City of Brass.

Vax lent the ring to Kerrek when Kerrek joined the party to help fight Raishan. He later gave it to Tova after she had helped them in the Nine Hells to make it easier for her to escape.

In Niirdal-Poc Syngorn assassins led by Myr'atta Viselor attacked Crown Keepers and tried to kidnap Ted, capturing him with Opal. One of the assassins wore a Rring of Greater Invisibility, which was picked up after his death by Opal.

Trivia
The ring of invisibility in D&D is likely based off the rings of power from Lord of the Rings.