For the knife I had to come up with a backstory. I took inspiration from the lore of Halo 5 Guardians. In the Warzone game mode players have access to upgrades for standard weapons. These include new scopes, suppressors, and energy bayonets. The bayonets in particular are made from reverse engineered alien technology. History shows that most technological innovations are made for military purpose and then further developed for civilian use. This particular model is a utility knife made by The Liang Dortmund Corporation who were heavily involved in the plot of Halo 5. Accidental activation by button could be very dangerous, so the knife is built like a standard flip knife.