Forged from the essence of the cosmos, this legendary weapon wields the power to harness dark energy and command the forces of the universe, summoning portals to the void. An extraordinary fusion of advanced technology and arcane sorcery, its sleek, midnight-black blade seems to drink in the very light around it, while luminescent indigo veins pulse rhythmically throughout its length. The hilt, intricate with celestial engravings suggesting spiraling nebulae, cradles a levitating core of shadowy energy, which exudes an unsettling gravitational allure. When invoked, the weapon warps the fabric of space, sending waves of distortion rippling through reality, and with a mere swing, it can unleash miniature rifts into oblivion, engulfing all in their wake. A sublime instrument of devastation and cosmic supremacy, it commands reverence and dread from mortals and deities alike.