It's been a while since I read AWA, so apologies if I miss something but my understanding is Ronan had one of the Powers sharing space with him, mostly lying dormant until needed. How, exactly, a Power does that is never explicitly explained. You have to assume the Powers move in mysterious ways their wonders to perform.
Some days it's just not worth gnawing through the straps
it was an avatar. the Powers That Be are able to have living avatars. the One's Champion was probably lying dormant in ronan untill It was needed to defeat Balor. the only reason why ronan ever knew He was there was because nita recognized Him. and once ronan knew the One's Champion was in his head he had to learn to Coexist with It or reject It.
as to how the powers do this i have no idea.
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