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 always felt that the game was a tad too easy. Maybe easy isn't the best word, as at times it can get excruciatingly difficult. I could fight through hordes by holding the right mouse button and spamming potions endlessly, or get destroyed in a single hit by a boss that is roughly my level.
But I did thoroughly enjoy Torchlight as a "portable" dungeon crawler. Being a guy who's almost never at home for most of the time, solo play amidst titles like Path of Exile and Diablo 3 were a Godsend. So after beating the game twice, I decided to get a little bit more content via Runic's generous decision to enable modding.
Synergy not only added a ton of new content, many of which I have yet yet yet to experience, but I can say without a doubt that the best change is hands down the battle system, which has dramatically changed the stats values to ensure that, while you're still absolutely smiting massive hordes of enemies, you're always on your toes, every battle, no matter how small. Enemies took way more hits to be brought down, but simultaneously, it took way more hits to bring you down, too. It makes it far more fair when taking on a single enemy, but that is quickly rebalanced to make the game challenging by providing much, much larger hordes which absolutely fill the screen and attack you relentlessly. To those who found Torchlight difficult, or just right, this mod may be hell itself, but to those who wanted a more traditional ARPG challenge, it's heaven. Highly recommended for the latter.