This thread is inspired by another: view original post
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.
Go!
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The Great Old Ones are ultimate, as Yog-Sothoth, son of the Nameless Mist, is All-In-One and One-In-All. Great Cthulhu lies dreaming in his house at R'lyeh, never dying, always in slumber until the stars align again. Ithaqua the Wind Walker soars above the sky, limitless in his scope of gust. Nyarlathotep, The Blind, Faceless One twists all into a madness of weird things. That is not dead which can eternal lie. And with strange aeons, even death may die.