Muramas

Muramas is one of the Twinblades of the Deceiver.

Source
This item is rewarded by the quest The Hunt (Suramar).

Trivia

 * The flavor text is spoken by Kil'jaeden when he is summoned at the Sunwell Plateau. It was previously the flavor text for Verus, the mainhand of this set.
 * Sword name is a reference to the legendary Japanese swordsmith, whose blades are said to be cursed, inspiring bloodlust in those who wield them.