Primordial Force: Emmited by his [Murdering Sword]
Murdering Sword: A sword made to sever human souls
Killing Intent: Cut 相手 even though it's not physical
Murderous Intent: Manifests as Red Sword Aura in 自分
Perfect Kill:: 相手's immediately cut at the start
The spear was made to hunt, the knife to butcher, the axe to cut wood, & hammer to open nuts & shape tools
Yet the Sword is the only one of these primordial weapons made to kill other humans.
Therefore, the pinnacle of Primordial Swordsmanship is the paragon of [Techniques Used to Kill Humans]
[Killing Star Doctrine]: A collection of techniques perfected to kill humans, utterly mastered by 自分