lumiflux, glowing art, A colossal Xuanwu, the black tortoise of North, the Xuanwu is a very special creature. It's made up of a black tortoise and a snake. In the misty and mysterious fairyland, it slowly emerges. The black tortoise shell is covered with ancient patterns that sparkle with deep green bioluminescence, like stars in the night sky. The snake is tightly coiled around the tortoise. It's not just any snake. It has scales that also emit a soft, mysterious light. The snake moves sinuously, as if it's dancing with the tortoise. The tortoise's  dragon head slowly protrudes, and its eyes are steady and profound, as if containing endless wisdom. The snake body is wound around the tortoise. The snake scales sparkle with green bioluminescence, interweaving with the light on the tortoise shell. The black tortoise's limbs move slowly, leaving bioluminescent ripples in the clouds with every step. The whole picture creates a mysterious and serene atmosphere, as if time has stopped at this moment. The combination of the black tortoise and the glowing snake creates an amazing sight