Season one has pretty much everything explained: https://www.curseforge.com/minecraft/modpacks/a-song-of-brain-and-brawn
The differences are new people, new mods, and we are back in 1.7.10.
The base pack has taken on a more medieval feel. There are plenty of ways to interact with NPCs to be able to advance your way as a team. The teams are also themed this time around. That stage is yet to be decided.
This is designed to be a multiplayer modpack. Work with a team and use your team mods to Go! Fight! Win!
Important notes:
There will be a popup after you launch saying that CodingLib may be missing. It has been added. Click "yes" to start loading. "No" will close Minecraft. This is from the voltzengine mod: https://www.curseforge.com/minecraft/mc-mods/voltz-engine
Currently working on a way to edit that out. Also working on the terrain generation side of things as those mods don't appear to be working.

