Halo 4. Questions and Impression of the end of Halo 4. Spoiler Alert!!!!!!

[DirtyP2002]

I thought the ending was something special.
I dislike these bossbattles at the end of a game, so I liked this one. Bossbattles are so 90s.

I never read any of the forerunners novels, so could you please explain in a little more detail what those things actually were? I thought I was fighting forerunners until I realised the real bad guys are the Precursors. Am I right that the didact is a part of them? It gets hard to follow the story when you read and play all the games / some of the novels in German. The translation doesn't help. Forerunners are "Blutsväter" for example.

THX for helping me out.