Once the Weed Eater unit returns with enough Tiberium Veins the are process and loaded into a chemical missile. The Laser Cannons are Nod's main form of base defense. The Surface to Air Missile Site is Nod's primary defense against flying units. The Obelisk of Light is an extremely powerful weapon for base defense. It has a huge powerful beam that stop the enemies heaviest units.
Few units survives a single shot.
The Technology Center gives GDI access to many advanced units and structures. The Technology Center gives Nod access to many advanced units and structures. The Service Depot is used to repair damage vehicles and aircraft assuming you have enough credits to pay for the repairs. The Missle Silo allows Nod to launch the cluster missle or chemical missle. The mysterious Temple of Nod allows the Nod player to access advanced units like the Mutant Hijacker and Cyborg Commando.