Prymus

With their star dying, a desperate race combed the galaxy for a new home. New found dark matter technology made them unstoppable. One by one, worlds fell to the power of Prymus, until they located their new home: Earth. Prymus knew how to use dark Matter, the cosmological constant, but not the true source of its power; a mistake they would pay for when Earth resorts to a weapon they don't understand either-the Ark of the Covenant.