Slim’s Spore Cloud Launcher launches a spore cloud grenade which disrupts the monsters ability to smell while standing inside of it. This prevents the hunters from being outlined, identified by name, or having their health revealed, giving them a better chance of evasion in combat. Better yet, it makes it hard for the Monster/player to tell which class is which, meaning it might assume an Assault character is a Support, which probably will not end well for said monster.