"What is this thing?"
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The Leviathan Core is the central room of a Leviathan Seed. It houses the Phazon Core and its guardian. Leviathan Core may refer to:
The Phazon Infusion Chamber in the Impact Crater and the Sanctum in the Sky Temple may be intended as the Tallon IV and Aether Leviathan Cores, but this is unconfirmed.