What the Librarian Unlocked for chief!?

Games Halo 5: Guardians
1

I know a lot may see it as a Geas of sorts. perhaps it is.

or perhaps it is the librarian giving back to chief the part of DNA that the forerunners once took away from the ancient humans before making them primitive.

Perhaps its both.

What do you guys think?!

2

Well, composer immunity for one, which was something the ancient humans definitely didn’t have. Aside from that, we have no idea yet. I really hope they expand on it though.

3

She gave him the ability to survive the array at the station.