Forged from the shadow-steel harvested from the event horizon of a dying primordial black hole, this blade is the forbidden relic of the "Eclipse Cult". Its matte, angular blade absorbs all light and sound, rendering the wielder invisible and silent in even the brightest environments. The geometric, hollowed handle channels the gravitational pull of the abyss, allowing the user to phase through solid matter for three seconds per strike.

The weapon is said to feed on the screams and memories of its victims, and prolonged use will cause the user's voice and identity to fade into the void. However, its shadow-steel core is catastrophically unstable; if used to strike a living star, it will collapse into a micro-black hole, consuming everything within a 10-meter radius and leaving only a permanent silence in its wake.