Obelisk

The Obelisk is a structure found in the Hidden Realm: A Moment, Fractured.

The player can interact with the Obelisk, being prompted if they want to obliterate themselves from existence, then being asked again if they are sure. Doing so will end the run, and unlocks the achievement True Respite, which also unlocks the character Mercenary.

This map can only be reached via the Celestial Portal, which spawns every three levels after the first loop next to the Teleporter.

Obliterating yourself with the Dio's Best Friend won't allow you to continue your run.