Datusha

Datusha, the Bane of the Moroi is the name of an ancient weapon currently wielded by Ashrah, who knows it only as her Kriss.

The weapon is, in fact, a powerful vampire slaying tool that manipulates its owners into slaying vampires purely for the bloodlust of the sword itself, while having the user think they are fighting for a higher purpose. It was once in the hands of a vampire known as Kahil Grigesh. To attone for his actions against his own kind, he ventured into the Netherrealm and committed hara-kiri, ending his own life and trapping the sword.

It is there, however, that Ashrah discovered the sword and used it to escape the Netherrealm. From there, the sword began compelling her to slay and unending amount of vampires, which brought her into comflict with Nitara.