Tribulation of myriad races

Looking for spoilers on Tribulation of Myriad Races

Hi seniors, I am looking for spoilers from someone who has finished the novel. I am at about ch 840, and the tled chapters are at 860 something. I have skipped ahead to the latest ch and apparently MC is still like 3 whole realms below relevancy, which is a bit alarming given the novel has under 1k chapters.

In particular I want to know -

a. Who is the traitor Invincible, and what is their motive (if they even have one beyond personal gain)?

b. Why are the divines and devils so scared of the multiple character faction?

d. What is the status of MC at the end-of story? How strong is he? Is he alive?

e. How does Xia Longwu's Dao affirmation go? Does he survive? Who else tries to ascend with him acting as scapegoat?

f. Lastly, does the prefect of Great Ming (Zhu Tiandao?) become an Invincible? I swear he has been acting the untalented son, just to ascend when everyone is off-guard.

Also what is the general gist of the story after

I will be almost-forever grateful for answers. I don't mind spoilers