A colossal underwater ocean kingdom nestled within a massive coral reef canyon, towering coral spires with living pearl formations forming cathedral-like dwelling chambers with swirling anemone walls, massive floating kelp platforms connected by cascading bubble streams, soft teal and electric aquamarine illumination from bioluminescent jellyfish illuminating tiny coral-guardians with pearl crowns riding giant sea turtle steeds between towering reef citadels, deep ocean navy and coral pink color palette with cool golden sunlight accents from distant surface, mystical serene mood, dramatic vertical composition with coral spires ascending through layers of floating plankton toward infinite sunlit ocean surface above, epic cinematic Lord of the Rings scale, hyper-detailed matte painting, 8K fantasy art