A stylized, Celtic-inspired magic portal. The portal is circular, made of ancient stone, with intricate Celtic knot carvings engraved around the outer ring. The stone surface has subtle signs of age and weathering, adding to its mystic aura. In the center, a swirling magical energy field glows with shades of blue, green, and silver—like a misty vortex. The ground around the base is slightly raised, with rune-etched stones forming a ritual platform. Magical particles and light rays emanate from the center. The design focuses on the geometric beauty of Celtic patterns with no organic elements. Lighting: soft ambient light with a slight mystical glow. High detail, hand-painted stylized textures, ideal for fantasy animation or game environments.