I excluded anything else from halo because they wouldn't even matter a tiny bit in this conflict.
So we have the Precurors, which can come back from death, bend reality at will and outlived multiple universes.
Then we have the Lovecraft myth, which includes gods that don't give a -blam!- about the universe at all, because they are not dependent on the universe but the universe is dependent on them.
Using citations is encouraged as they are undeniable proof (and also I was not arsed enough to buy and read any of the books, due to shipping). Also coherent reasoning why one is more powerful would be great.