Synergies is full conversion and balance mod for Torchlight 2. It is currently the top rated mod in the Steam Workshop, and it has had over 100 content updates!!
This MOD, being a full conversion mod, adds a lot of new content to the game.
Installing a mod for torchlight 2 in the pre-guts stage is a pretty basic drag and drop procedure that involves unpacking a zipped file into a directory.