Ok, Victory, should we start?
The summary of the most summarious summary you can ever find (lol): At first, there were the Precursors, wich created Forerunners and Humans. *missing info* The Forerunners rebelled, and fought the Precursors leading them to the boarders of the Galaxy. Flood appeared, infected the Humans' colonies. They sought protection in the Forerunners' territory. Human-Forerunner war started. Forerunners won (Humans had to fight between two fronts, and their allies San 'Shyuum betrayed them), de-evoluted Humans, encountered the Flood. Forerunner-Flood war. Flood won. *missing information->Silentium* Halo array fired.
Protagonists: -Bornstellar makes eternal lasting: will eventually inherit the Didact imprint and role,
- UR-Didact: husband of the Librarian, Commander in Chief of the Forerunners Armies,
- Librarian: wife of the Didact, many things (Human "code", or imprint with Ancient Important Humans memories, transformed the Halos in little "arks")
-Chakas and Riser: two humans that will be in the middle of the Forerunner civil confilct, Chakas will eventually become 343.
-Master Builder: built the Halos, tried (sometimes, succesfully) to use them against the Humans, is believed dead.
- Primordial: at the end of Primordium, it is revealed that he is a Gravemind of Precursors. He talked first with the Humans, some suicided then they decided to put him in "stasis". Then the Forerunners accidentally freed him, put Mendicant Bias to interrogate him, Bias went crazy and fired 5 (at the beginning there were 12 Halos) Halo rings on the Forerunner world. (Does this means all the Precursors were Flood?)
I omitted many, many, many things (oh, so many), but you asked a sum...
(I understand you hate Greg, but you should at least read the final battle in Cryptum, it's sooooooo epic... )