Majestic Mastodon Leviathan, underwater, dark blue gradient background, bioluminescent accents, glowing eyes, sharp tusks, wrinkled skin, oceanic plants, coral reefs, schools of small fish swimming around, majestic posture, powerful muscles, ancient wisdom, mysterious aura, dramatic lighting, cinematic composition, 3/4 view, slight fog effect, detailed texture, realistic scales, shimmering water surface.