fantasy tree cathedral 3d model

A hollowed-out ancient tree interior, cathedral-scale organic architecture, massive gnarled roots forming natural pillars and Gothic arches, thick bark walls with deep crevices and rough texture, vibrant green moss growing on surfaces, clusters of bioluminescent mushrooms and fungi glowing in soft cyan and emerald attached to bark, scattered fireflies as tiny glowing orbs, beams of warm golden light filtering through holes in the canopy above, volumetric god rays, damp forest floor with twisted roots, fantasy nature environment, highly detailed sculpt, realistic organic forms, game asset quality, clean topology, 8k texture detail