The Moonstone Chamber was/is where the ancient, almighty Moonstone Opal had been kept for many centuries after its sudden descent from Heaven. Afterwards, the Opal's incredibly powerful and unpredictable defenses continued to expand, giving birth to a faraway kingdom, which came to be called "the Dark Kingdom" due to the ancient evil that created it.
- Beyond the Walls of Corona (debut; flashback)
- Rapunzel and the Great Tree (flashback)
- Destinies Collide (actual debut)
- Rapunzel's Return, Part 1 (final appearance)
About the Moonstone Chamber
- "The Moonstone Chamber is just through those doors."
- "There it it is, Son- the Moonstone."
- "No one many enter that room!!"
- "I'm going in and you don't wanna get in my way!!"