It may sound weird but the fun you have in killing being a monster is unparalleled. Still interested? Read on for the complete Gears of War 3 Beast Mode strategy guide and tips. The difference is that you would be controlling beasts (Locusts) than COG members, and killing Humans instead of Locusts. My imagination was to kill Locusts but it’s actually a bit different. When I first heard the name of this mode, I had locusts in mind.