My SpOps Theories:
Eventually Majestic/Crimson needs to save Halsey from Jul M'dama and take the 2nd piece of the Janus Key from him then make their way towards the "Absolute Record" in Spartan Ops Episode 10.
Janus Key is the Map and the Absolute Record is the Ship? Gateway/Portal?
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Taken from Halopedia:
Librarian: "This is the Janus Key. It offers the real-time location of every piece of Forerunner technology in the galaxy. Halsey: "Every piece?"
The Librarian connects the two pieces together. Holograms ofstarsystemsburst from it andsurround the two women. Halsey examines them in fascination.
Librarian: "We did not create so much without a means tocatalog it all. This was meantfor my husband to help you people...when his meditation was complete."
The Librarian separates the pieces, and the holograms disappear. She holds out the pieces to Halsey.
Librarian: "Take this key to the Absolute Record. Use what you find to propel humankind." Halsey: "Why give this to me?" Librarian: "Requiem's time is at an end. The key and what it details must not be lost."
Halsey tentatively takes the pieces from her. With a flash, Jul 'Mdama pulls her out the artifact, Halsey still clutching the keys. 'Mdama notices a piece and takes it from her.
Jul 'Mdama: "(Sangheili) This is the Librarian's gift?"
'Mdama drops Halsey and examines the half-key, unaware that Halsey has the other.
Jul 'Mdama: "(Sangheili) This is what we came for? Full of the Forerunner's secrets?"
'Mdama's guard screams and is thrown in the arm. Thorne uncloaks and pulls out his assaultrifle.
Halsey: "Thorne!!"
'Mdama grabs Halsey and holds her in front of him.
Jul 'Mdama: "(Sangheili) Blasphemy! Kill the intruder!"
The other guard swings its sword. Thorne ducks, hits its head, then fires an assaultrifle burstintoits chest.
Halsey: "Thorne, take the key!"
Halsey tosses her half of the Janus Key to him. Thorne catches it, and examines it.He looksupupon hearing a gunshot, and sees an Elite about to attack him fall dead from Palmer's sudden rescue.