ancient stone portal 3d model

A monumental centerpiece terrain tile for 28mm wargaming, featuring a massive ancient stone portal archway. The base is a perfect solid square block with completely straight, vertical, flat smooth outer walls. The surface shows an intricate, weathered stone plaza covered in deep, filigreed cracks and geometric patterns with carved runic scripts. The central opening of the portal is a swirling vortex of energy. The arch itself is constructed of dark, rough-hewn stone, deeply etched with complex runes and arcane symbols. Embedded in the ground before the portal is a mechanical circular gear ring with fine engravings and teeth, containing a central slot with an intricate runic artifact disc. The entire structure features detailed, thick, stylized geometry with minimal supports, designed for sturdy FDM 3D printing on an A1 Mini. All four outer edges of the square base are strictly straight, razor-sharp, flat, and square, with a perfectly flat bottom.