The Light Marble is a miscellaneous item that can be acquired in The Nightmare. It is currently obtainable as a possible drop from The Lost, a boss that can be encountered after unlocking the Hidden Key Door in The Grand Hall with a Hidden Key.
The Light Marble is used as one of the two 'keys' to unlock The Vault, a room that can be accessed by entering The Grand Hall, however, players need to have a Mansion Key beforehand before they could unlock The Vault, access The Grand Hall and The Mansion in order to proceed.
In appearance, the Light Marble is a powerful white-bluish orb 'levitating' in the very center of the outer ring of the marble. The Light Marble's ring appears to be made out of materials created by the nightmares.
- If the players had lost their Light Marbles upon death or had dropped it onto the ground, they may interact with the Pig in Topple Town to get the Light Marble again.
- The Light Marble's counterpart is the Dark Marble.
- The Giant Ratfolk has a vision of the two marbles after the player collects 500+ Rat Tokens.