Some enemies (I think) cast random runes on you. Or the GNR or whatever does it. It turned me into a dreadfully slow goblin! :P
Awesome game by the way. One of the most replay worthy games here in quite some time!
Cool idea, but the formulas are so arbitrary, it could as well be random.. (in fact it would be better). Maybe you can think of more intuitive combination results? Or maybe some way for the player to see what he's gonna get? Right now the challenge of the game seems to be to memorize the formulas.