I'm imagining that this armor (separate post) would most likely be deployed on a new enemy type: The Spider-tron 7000, the 7000 would have two eyes, two bows (side-mounted), one Zero G Grenade cannon (separate post), the armor, and six legs. This new enemy would most likely be deployed around wave 20. The Zero G Grenade cannon plus the two Side-mounted Bows would be a lethal combination; thus it appearing at wave 20.