A glowing, ornate sword with a feather and intricate design against a starry background.

In the vast expanse of a starlit night sky, a magnificent, ethereal sword glows with an otherworldly radiance. The blade, curved gracefully like a crescent moon, is composed of shimmering ice, each facet catching the light and reflecting it in a dazzling array of blues and whites. The handle, intricately designed with ornate patterns, is adorned with a single, majestic feather that adds a touch of elegance and mystery to the weapon. The background is a deep, dark blue, dotted with twinkling stars that seem to dance around the sword, enhancing its mystical aura. The overall mood is one of enchantment and power, as if this sword is a guardian of the night, ready to defend against any darkness that might threaten the celestial realm.