Satsujin-ken, AKA The Short Lived Unknown Fighting Syle Is A Powerful Fighting Style That The Galactic Union Used In Their Human Aresenal Apart From Their Space Weaponry. The Satsujin-ken Is A Powerful Fighting Technique Because It Kills Anybody In One Hit, It's The Most Deadliest In Fighting History Today. It's Kanji: (殺人拳) Which Has No Little Than 3 Letters, And It's Famous In The Japanese Metroid World.

Soi Fon Is A Complex Master Of This Fighting Technique, Morrigan And Felicia Who Are Also Skilled At It Because They Fought Fights For Money. That's How They Got Their Company Building Morrigan Corperation.