Slim's primary weapon, which deals damage to the Monster while reducing the cooldown of his Healing Burst ability. The cooldown is reduced based on the number of shots that hit the monster and other wildlife. Approximately 3 hits will recharge it fully. It functions somewhat like a shotgun, and is referred to as a shotgun during Slim and Markov's converstation. Slim's Leech Gun is biomechanical, having what appears to be biological components such as muscle tissues and ligaments visible inside the weapon, which is visible when reloading. This weapon uses "maggots" as ammo which fires green biosynthetic discharge. These maggots are fed with a nutrient slurry.
There's an inscription on the back of the gun, just behind the sights, that says "Novi Milites, Novum Mundi," which means "New Troops, New World" in latin. According to Matthew, the game's writer, this is the Basilisk Soldier emblem