I want to know what people think is Cortana actually the Cortana we know in the previous games and was just repaired by the domain or that because Cortana was rampant when she was being repaired therefore your repairing something that is already corrupt and that explains the nature of her plans in Halo 5? I do hope that it is because she is corrupt not that 343 would really think Cortana would even think of doing this to the universe.
She told Chief that she got cured from the Rampancy and while in slipspace she stumble upon the Domain, she also somehow attained Metastability