A dark epic book cover for a fantasy sci-fi novel titled "The Undying Circle." A massive ancient stone throne sits at the center, cracked and half-submerged beneath the glowing foundations of a colossal futuristic megacity that towers above it into a permanently black starless sky. The city rises in endless layers — bio-glass towers with amber and deep red glowing windows, flying pods leaving trails of cold blue light cutting through the dark air between buildings, the underside of the city's infrastructure burning with rivers of orange fire-light like veins of molten gold beneath glass floors. Far above the city a pale white floating structure — the Echelon — hovers above the clouds like a second cold moon, luminous and untouchable. The entire composition is framed by an ancient circular ring of gold engraved with five kingdom symbols — a flame, a wave, a root, a chain, a sun — glowing faintly as if alive. The color palette is deep black, dark violet, molten amber, blood red and cold gold. Cinematic lighting. Epic scale. Photorealistic. Ultra detailed. 8K. Book cover composition with space at the top for a title.
