The Sightless

The Sightless One was an entity that, during the Age of Arcanum, made a pact with the arcanist Clemain Astural. They were first mentioned in Critical Role: Tal'Dorei Campaign Setting; so far, they have neither appeared nor been mentioned onstream.

History
During the Age of Arcanum, Clemain Astural, a powerful arcanist, had peered into the Far Realm, a realm beyond the Planes of Existence, in search of power that would allow him to cease war around the world. Within, he found the Sightless One, with whom Astural made a pact under the belief that the entity would serve him. As a result, at the cost of his sanity, Astural's power grew, fueled by the Sightless One, allowing the arcanist to sweep devastation over southeastern Tal'Dorei until he was killed by a group of heroes at Wrettis.