Pamela Bousquet's Pendant was a magical necklace that the Warren witch, Pamela Bousquet stored her powers within before she died to keep her love spell on Qalmor intact. After her death, Qalmor's archnemesis, the Master, sent his minions to steal her pendant for future use.
In 2001 on Samhain, the pendant activated when Pamela's spirit returned to the world of the living. Pamela started channeling her powers of invisibility and telepathy through it, but was unable to undo her love spell due to the Master's interference.
He later destroyed the necklace to release Qalmor from the spell.