The Mortis Dagger was a blade created from the Force itself. The dagger has special powers that allow it to kill powerful force-users such as the Father, and his Son and Daughter. Obi-Wan Kenobi was given this dagger by the Daughter to kill the Son. Kenobi threw it to Anakin Skywalker for him to use, but was intercepted by Skywalker's padawan, Ahsoka Tano, while she was still under the Son's dark influence. Tano gave it to the Son, who attempted to kill the Father, but the blade was intercepted by the Daughter, who sacrificed herself to save him. The Father had it buried with his Daughter. The Son, angry, tried again to kill the Father with it, but the Father took the blade from him and stabbed himself.