Mass Disorientation's actual ability disables the enemy fleets Sub-light Main Engines and Sub-light Maneuvering Engines as well as increasing the enemies weapons cooldown by 25%.
Besides being hilarious, this also deprives all ships of their weapons capabilites except capital ships. This one ability more than any other makes the Starbase capable of dealing with any sized fleet, as the size of the fleet does not matter when they can't move or shoot. There is no mention of it, but the second upgrade increases the range slightly as well, from 8500, to 12000.
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