Create a stylized 3D leviathan for Roblox game 'Fish'. It should have a serpentine body, large flowing fins, and smooth, simplistic textures. Use ocean blue, green, and glowing aqua accents, especially around the head and fins. The creature should look majestic and intimidating, with large expressive eyes and a mystical aura. Keep the details minimal but visually striking to match the Roblox aesthetic.

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