Fight hordes of enemies. Collect Inventium and loot. Craft crazy weapons, impractical armor and improbable gadgets. Level up your character and pick from a wide selection of perks. Level up your weapons and watch them evolve new stronger and stranger features. Complete challenges and achievements to unlock secret weapons and relics. Save the world from an ancient evil. So you know, the usual stuff.
As Always, Good Luck and Have Fun.