d20 Twenty-Sided Die

The hero die from the reference: a regular icosahedron 0.020 m between opposite faces, twenty dead-flat equilateral faces with crisp edges and the kit's 0.6 mm chamfer ring, cast in cat's-eye green resin where each face reads as a deep core lifting to a rim.

风格：low-poly, flat-shaded vertex colors, no textures, 2 materials: the shared opaque one plus a distinct surface (glass, water or chrome), which stays its own mesh through mergeAssets rather than merging into the rest; shares palette and scale with its kit