The Mentor's Ring is a prized possession for any apprentice to magic. It lends the wearer the ability to increase their intelligence and wisdom, thus making their use of magic more efficient.
The High Wizard Carni Asron is said to be its creator, and he loaned it to apprentices while they were studying under him. After Asron's death, the ring and several other of his possessions vanished and have been circulated throughout Tamriel.
By 3E 427, the Ring was stored within a ceremonial ash urn belonging to a Lord Brinne, within the Samarys Ancestral Tomb in the Bitter Coast region of Vvardenfell. The ring would later be recovered by the Nerevarine.