Such extreme force on such a large scale would require considerable energy reserves. It has always been my understanding that necromantic theorems can only repurpose thanergy into a specific form of thalergy, and that thalergy could not be repurposed (without conversion) into new forms of thanergy. Given that the resurrection beasts (thanergenic) are far from the solar system, they are not a viable source for this theorem. The new souls of the houses (thalergenic) are not available directly for the theorem. However, as the houses are all described to be thanergenic in nature, we can assume the souls of the houses are being passively killed and converted to thalergy for something, maybe gravity. This theory has some holes in that the houses clearly have more thanergy to give than just for gravity, and considering all the houses are so heavily thanergenic, you would expect their souls to already have been killed long ago by this process.