Current Fab formats
FBX static mesh plus Fab-converted GLTF, GLB and USDZ formats.
Try one complete Knit of Shadows environment asset at no cost, then decide whether the wider gothic / arcane collection fits your project.

FBX static mesh plus Fab-converted GLTF, GLB and USDZ formats.
The listing includes 2K PBR textures for the asset.
The asset is currently listed as free. Fab remains the source of truth for current license, availability and disclosure details.
If the silhouette, stone treatment and violet crystal direction work for your scene, continue into the full Knit of Shadows catalog rather than buying blind. If you are planning a larger structure, the arcane-building guide explains how walls, stairs, doors, pillars and focal floor pieces work together.