If you’ve read the books, you probably know that the didact is the main enemy.(this is proven at the end of the trailer)However, exact motives for hostility towards humans is unknown…or is it?
Below are some facts…
Fact: The UNSC Spirit of Fire’s crew destroy a forerunner shield world.
Fact: Master Chief destroyed Alpha Halo (Installation 04).
Fact: Delta Halo was glassed by the elites thereby making the installation useless. (since most elites allied themselves with humans, humans are partly responsible)
Fact: Master Chief and the Arbiter destroyed instalation 04B and damaged the ark.
Fact: The entire Halo array is possibly useless since the ark is damaged. (there is now no defense against the flood)
Fact: The librarian (didacts lover) spent the last of her days on Mt. Kilamanjaro in East Africa because she believed in humanity.
Huge Fact: 343 Guilty Spark (made from memories of the didact’s human friend chaka) was killed by the chief.(a fragment survived but i don’t think the didact knows that)
Personaly, if I were to wake up from 100,000 years of sleep to find out that everything you fought for (halo array) was destroyed, I would be beyond mad. Basically, the didact might take personal revenge on…oh i din’t know…earth.
Humanity (and maybe the elites) may have to fight for survival, AGAIN. Based on what Guily Spark said in “the maw” terminal in anniversary, a company of promethians could restore order against a covenant armada,the human resistance, and the flood. He also mentions that humanity and the covenant would prefer fighting the flood rather than the didact when enraged. Remember the fleet of forerunner ships in Halo Wars? If there was a fleet of ships on that world, there is most definatly a fleet of ships where the forerunner military commander lives. The prophet of truth said that the fleet could crush humanity quickly and with ease. That was said when humanity still had the outer colonies, what makes you think they’ll stand a chance with just earth, a rebuilding fleet, and a handfull of colonies? (Halo 5’s dark and horror like storyline?)
The key to defeating the didact might be the librarian herself, after all, it is stated in primordium that she may still be alive. (Kind of like in halo 2 when the Arbiter, Miranda, and johnson learned of the ark)
Who knows, maybe she’s still sleeping under the sands of africa, waiting to be awakened…