Giant killer cannons
The giant killer cannons are massive cannons that are able to pierce the skin of the Terror giants. It does this by sending out chunks of hot rippp-m that puncture the Giants skin, then the cannon shoots a laser at the giant, and the laser is able to go through the holes in the skin that the rippp-m made. they take very long to reload though this is why the terror giants were able to break through the defenses on 4-ZO