Discovering math. functions for damage formulas was one of the greatest things for me.
It's very useful for balancing skills to work in a variety of possible circumstances.
For example if you have a skill that is supposed to work for both mages and warriors:
The video of a psycho chasing people on the streets with a sword before getting subdued is wild. Apparent screenshots of his Twitter feed (EDIT: confirmed by Dallas police) before it went private reveal a dangerous delusional mindset. I heard there was a bow person too. The crazies are really coming out of the woodworks.