A colossal ancient coral reef kingdom nestled within a massive bioluminescent underwater canyon, towering coral spires forming cathedral-like dwelling chambers with intricate calcium carbonate walls, massive floating coral platforms connected by cascading bubble curtains, soft electric teal and warm amber bioluminescence from glowing sea creatures illuminating tiny merfolk guardians with pearl crowns riding luminescent seahorses between towering coral citadels, deep ocean navy and midnight teal color palette with cool violet deep sea accents, mystical enchanted mood, dramatic diagonal composition with coral spires ascending through layered ocean currents toward infinite star-filled surface above, epic cinematic Lord of the Rings scale, hyper-detailed matte painting, 8K fantasy art