This pendant is said to have been created by a powerful mage who was obsessed with uncovering lost and forgotten knowledge. The pendant is made of a dark, almost black metal, and is set with a single, large gemstone that glows with an eerie, pulsing light.

When worn, the pendant grants the wearer the ability to see through illusions and disguises, as well as the ability to detect hidden objects and secret passages. Additionally, the pendant provides a +2 bonus to the wearer's Wisdom score, increasing their perception and intuition.

However, the pendant has a dangerous side effect - over time, the wearer becomes more and more obsessed with uncovering hidden knowledge and secrets, and may even begin to lose touch with reality. The pendant's power is highly addictive, and many who wear it have been known to go to extreme lengths to uncover lost knowledge, even at the cost of their own lives and the lives of those around them.

Overall, the Pendant of the Lost would be a highly coveted item for any adventurer or scholar seeking to uncover lost knowledge or secrets. However, its dangerous side effects and the risk of falling into obsession make it a highly coveted but risky treasure to possess.

Notes: the wearer must spend a short rest focusing on the pendant and its dark energy. During this time, the wearer must make a Wisdom saving throw (DC 15) or suffer one level of exhaustion. If the saving throw is successful, the wearer is attuned to the pendant and gains access to its powers.