The Bryyo Leviathan Core is the core chamber of the Bryyo Leviathan in Metroid Prime 3: Corruption. It is nearly spherical in appearance and is the battlegrounds for the fight with a Mogenar-class Ancient Reptilicus War Golem. The war golem appears to be receiving energy from the Phazon Core before the fight between itself and Samus commences. There are three inaccessible gaping holes in the Bryyo Leviathan Core: one on the Western wall, one on the Northern wall, and one on the Eastern wall, each pulsating in a rhythmic manner.
- Hyper Ball
- Samus must defeat Mogenar to gain this item.
- "Ancient Reptilicus War Golem appears to be receiving energy from the core of the Seed."
- Opening (before battle)
- "Large amounts of concentrated Phazon are pouring out from the Seed's core and onto the golem."
- Opening (during and after battle)
- "The Seed's core is contained within this opening. It relies on a corrupted creature for protection."