The photon cannon is an automated defense structure of protoss design. Although the protoss revel in the glory of personal combat, they also recognize the need for automated defenses. As such, the cannon fires an encapsulated antimatter sphere similar to that generated by the dragoon, which can target air and ground targets. They are enhanced with special sensor technology borrowed from the observer. Photon cannons require a link to the psionic matrix generated by pylons.[1]
All protoss commanders are able to construct photon cannons in Co-op Missions. Karax is able to upgrade his photon cannons and warp them in instantly once he reaches Level 6. Karax is also able to instantly warp in photon cannons upon reaching Level 11.
The photon cannon initially structuraly resembled its predecessor, retaining its 'telescope'.[3] It was replaced by the phase cannon early in the development of StarCraft II.[4] It has since returned in name and ability, although uses the phase cannon's model.[3]
