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The photon cannon is a Scrin heavy anti-armour base defense, rivalling GDIGuardian cannons and Nodlaser turrets. Despite their name, they appear to use plasma discs as a main weapon. They can be upgraded with Tiberium shard launchers, increasing their damage per second output by nearly 140%.
They cannot target aircraft, relying on Plasma Missile Batteries for that purpose. They are often paired with Buzzer Hives as well, to cover their weakness to infantry.
While the plasma disks on a Photon Cannon are fairly lethal to vehicles, upgrading them to fast-moving Shard Launchers provides a potent increase in damage.
Purchasable at any Technology Assembler for $2500 and takes 1:15 to research. Hotkey: Ctrl+S.