As seen in the quote below, the Domain/Organon was the collection of all knowledge which Cortana has now accessed.
The Precursors had the ability to transcend sentient life and its development, and with Cortana being the one Unique AI based off a human mind, potentially explains her Rampancy being “cured”.
Now i know That at the end of Halo 4 Cortana fragmented herself into the Didacts ship. Therefore the Cortana we see in 5 is not whole, which helps to explain the behavior.
My main question in regards to this is:
When the Halo rings were fired by the Forerunners, the Domain is said to have been destroyed because it was an artifact of Neural Physics. If that is the case, then how has Cortana access something that was supposedly destroyed?
“The Precursors’ Organon—a web of information of billions of years of Precursor knowledge that is also known as The Domain by Forerunners—demonstrates Precursor technological advancement. The Organon was destroyed when the Halo Array fired, as it was an artifact of Neural Physics…”