It is ... Smart Bomb (either supply depot or space port - does not matter). When you drop it on planet, it seeks and destroy buildings with resupply/spaceport ability, such as Cultural Centeres One round of fire from puny battlecruiser will nuke your homeworld back to the Stone Age
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It is forbidden to kill; therefore all murderers are punished unless they kill in large numbers and to the sound of trumpets. - Voltaire