What about Darth Nihilus, who quite literally eats the energy of all living things for breakfast. Revan, Sion, Darth Traya... All those people had incredible power.[spoiler]not to mention the Star Forge's unlimited supply manufacturing.[/spoiler]
Edit: maybe [i]that's[/i] where Revan left to go fight... He left the system to go fight Halo!!
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The force doesn't directly affect extra galactic life look at the Yuzan Vong neither Jedi nor Sith can directly hurt or use the force against them even force meditation to predict future battles and enemy numbers doesn't work. As for the star forge there's only one while the forerunners alone have hundreds of ship building yards and they can be produced in an extremely short amount of time. Fleets of single attack fighters and war sphinxes each with enough fire power to vaporise cites and up turn continents all created in minutes.