Dark armored female knight above a swirling cosmic nebula

A solitary female knight clad in obsidian armor, standing on a precipice overlooking a swirling nebula. The knight's visor reflects distant galaxies, and ethereal wisps of cosmic dust trail from their cape. The landscape below is a surreal, alien terrain with crystalline formations. The style is dark fantasy, painterly, with a touch of 3D digital art for depth and luminescence.