History of Lantern of Osiris

The Lantern of Osiris is a seasonal artifact. It was first earned in Season of Dawn, where it is granted after the Sundial's main mission, A Matter of Time, which focuses on Osiris on Mercury.

In the Empyrean Foundation event, the Lantern is used in the final cutscene: after the seventh stage, interacting with the Tower Obelisk shows the Guardian using the Lantern to rekindle a lighthouse on Mercury.