I propose an EMP mine which kills the power to all ships within a very large radius for a minute. After a minute the powercell starts up again and the ship starts to charge. So you'd drop the mine and 20 seconds later it fires regardless of whether anybody is near it or not. The only sensible way to use it would be to drop it, leave the sector and pop back after the 20 seconds and mop up the enemies whilst they are defenceless including cap ships. Obviously this thing would be hideously expensive / rare/ difficult to come by.

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