From the ship, a few hundred kilograms. Multiply that by another 10,000, because their shield would, again, deal with constant bombardment. 700x50=30,000. 100,000x30,000=3,000,000 newtons. 3,000,000x10,000 (because amount fired is 1,000, and recovery time wouldn't be enough), is 30,000,000 newton equivalent of sustained force. This is not including the forerunner weapons and broadsword skrike, which would happen to the core.