"Faster melee speeds and kills cause enemies to gore into bits which will not reveal their death locations."
— In-game description for the Katana - Masamune version of Assassin Build
Assassin Build is an Epicgun perk in Call of Duty: Infinite Warfare. It is exclusive to the VPR - Yokai and Katana - Masamune variants. The perk affects both weapons differently; the VPR - Yokai is given a built in suppressor that can remove the death location symbol of an enemy killed, while the Katana - Masamune's version of the gun perk allows it to have faster melee speeds, as well as cause enemies to gore into bits when killed, which will not reveal their death locations as well.