Synergies is a end game raid expansion and balance mod for Torchlight 2 that won EDITORS CHOICE BEST OVERHAUL: 2013 in the MOTY AWARDS!
I have been playing this mod for probably a month or so. It just keeps getting better and better.
Updates are regular and there is a forum where you can suggest ideas and generally be a part of the mod creation process.
While the mod itself is still a work in progress, it is quite playable with the current content.
I die, therefore I am Grinder. :)