The Skull Knight was forced to unveil his Sword of Actuation following Slan's defeat in the deepest level of Qliphoth. He used it to send the subsequent swarm of multiplying trolls and ogres swirling into the Abyss before tearing open a portal leading to Qliphoth's uppermost level, which he used to escape with Guts and return the swordsman to his companions.
Later, atop the twice reincarnated Ganishka, the Skull Knight uses the Sword of Actuation in a seeming attempt at Femto's life; however, the sword stroke aimed for Femto is redirected by the demon towards Ganishka, tearing open the apostle-emperor's Shiva form and triggering the World Transformation.
It has been shown to possess space-cleaving capabilities, reaching into even the depths of the Abyss. The sword is also capable of cutting open spacetime dimensional portals leading to other locations within the physical realm, and thus allowing for well-nigh instant travel. It was by way of a space-distorting tear formed from this sword that Ganishka's Shiva form was converted into the World Spiral Tree, thus triggering the merging of the physical and astral realms.
- In spite of commonly being colored crimson in mediums outside of the Berserk manga, the Sword of Actuation has no confirmed color. The Skull Knight clarifies that the behelits which constitute the Sword of Actuation are in fact those he has taken from apostles specifically.