I took ATM, Dark RPG plus several of my favorite mods then smashed them together. What I ended up with was really fun so I'm sharing it with everyone. There are over 400 mods and built in achievements for most of the more complex mods to help give you goals, move through the modpack and gain a better understanding of how they work. From Dark RPG there are skill trees for combat and mining along with many different guns and other cool weapons. You can play as a vampire, vampire hunter, werewolf, warlock, gunsmith, and mage; which group will you choose to join? Actually you don't have to choose because you can play them all. There's gobs of loot, lots of dungeons, dozens of biomes, and several bosses to defeat. I will continue to update this pack to increase fun and stability.
FYI make sure to check out all the achievements at the start of your adventure!