Spoilers for Halo 5 ending
Ok, Cortana, you intend to bring peace through tyranny with you and The Created as the masters of The Mantle…and yet your first major action at the end of Halo 5 is to suddenly cut all power in all human settlements…WHAT THE -Yoink- WERE YOU THINKING? This is gonna make the humans even MORE resistant, because now they are panicking, they feel threatened. Cortana should have know that the first step of conquest is diplomacy. Acting like an -Yoink- is NOT going to bring people to your side.
Oh, and, giving immortality to ALL AIs that join her…a betrayal is all but inevitable. At least one AI is gonna try to overthrow her, I guarantee it.