世界漫遊者奇幻藝術

Create a vertical fantasy achievement artwork for {argument name="achievement name" default="Worldwalker"}: a lone hooded traveler stands at the center of an ancient circular stone nexus, viewed from a slightly elevated cinematic angle. The scene is dark, mystical, and epic, dominated by violet, indigo, black, and magenta lighting with subtle gold and icy blue accents. Show exactly five distinct world portals arranged around the traveler, each representing a different realm: 1) an oval portal on the left framed by twisted black roots and vines, opening to a warm golden forest at sunset; 2) a large vertical floating-stone portal at the upper center, cracked with purple lightning, revealing a distant spired crystal castle over a surreal alien landscape; 3) a sharp triangular ice-crystal portal on the right, glowing cold blue-white and showing a frozen city of crystalline towers; 4) a swirling spiral galaxy vortex portal at the lower left, filled with stars and purple cosmic mist; 5) a blocky pixelated cube-fragment portal at the lower right, glowing magenta and showing a neon digital cityscape. The central traveler should be small but heroic, wearing a dark cloak and holding a staff or walking stick, standing on a circular rune-like floor with pathways radiating toward each portal. Use intricate environmental detail, floating debris, fractured stone, magical particles, atmospheric fog, volumetric light, painterly concept-art rendering, high contrast, sharp silhouettes, and a premium game achievement badge feel. No readable text, no UI frame, no logo, no watermark.