Elysian Leviathan Core is the main chamber of the Elysia Seed, where Helios and the Phazon Core reside. Samus Aran does battle with Helios here. After defeating the mechanoid, she obtains the Hyper Missile and fires at several growths full of Phazon crystals to summon the Phazon Core so that she can fire her Phazon at it and destroy it. The layout of the room is the same as any other Leviathan Core in the game, but has an orange color-scheme to it instead of the blue depicted in Bryyo Seed and the purple depicted in the Pirate Homeworld Seed.