Mondreus is a planet given as the origin of the Bounty Hunter Spire, the last known Diamont. Its status is unknown, and depending on what circumstances led to the Diamonts' disappearance, it may no longer exist. Regardless of the case, Samus Aran is never seen setting foot on this planet.

The introduction cutscene of Metroid Prime Hunters shows Spire in a location that may represent Mondreus, as a barren and rocky world with an orange sky, not unlike the appearance of the Diamonts themselves.

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