This tactical dagger was forged from the propeller shaft of the USS Abyss 🚤, a stealth submarine that was lost during the 2281 "Trench War" in the Mariana Trench. The shaft’s high-tensile steel had absorbed decades of hydrostatic pressure, giving the blade a natural ability to channel kinetic energy into a concussive wave. The dual vents in the blade are not for weight reduction, but to amplify this wave, allowing the dagger to crack underwater armor or stun enemies from a distance. The wave-patterned handle is lined with pressure-sensitive nodes that sync with the user’s combat suit, adjusting the wave’s intensity based on grip strength.

However, the weapon carries the ghosts of its past. The submarine’s captain, Elena Maro, sacrificed herself to scuttle the vessel and prevent its stealth technology from falling into enemy hands. Her consciousness, imprinted on the steel by the extreme pressure, still lingers in the dagger. Those who wield it report hearing her final orders—"Scuttle the ship. No survivors."—and experiencing vivid hallucinations of the submarine’s final moments, as it imploded under the trench’s pressure 📊. Worse, the kinetic waves can inadvertently destabilize underwater structures; during a 2283 salvage operation, a mercenary using the dagger triggered a landslide that destroyed a research station.

The dagger was recovered by a team of deep-sea divers, who sold it to a black market arms dealer. Today, it is known as the "Dark Tide Rift," a weapon that carries the weight of the ocean’s deepest secrets.