A massive rock with metal spikes. Can only be used in a Catapult Turret.
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Catapult Turret
Advanced Bullet 
Advanced Rifle Bullet 
Advanced Sniper Bullet 
C4 Charge 
Cannon Ball 
Cannon Shell 
Chain Bola 
Explosive Arrow 
Flame Arrow 
Flamethrower Ammo 
Grappling Hook 
Jar of Pitch