Majestic cyber sigilism knight, tall slender female silhouette, faceless spiked helmet with glowing magenta sigil at the center. Intricate dark biomechanical armor covered in glowing neon cyan and magenta circuit patterns, sacred geometry runes, and swirling sigil motifs. Long wispy energy tendrils flowing from the back and waist. She holds a massive jagged greatsword pulsing with bright crimson neon energy and glowing runes. Her lower body dissolves into glowing root-like energy tendrils anchored to rocky ground. Large luminous magical circle / sigil mandala floating in the misty dark background, geometric symbols and faint constellations. Smoky ethereal atmosphere, soft volumetric light, glowing particles and sparks floating, dramatic rim lighting, deep shadows, mystical sci-fi dark fantasy fusion, cyber sigilism aesthetic, intricate line art, vibrant neon glow, epic composition, masterpiece, 8k, ultra-detailed