And of course, just in case you not do this already, let the values of ALL monsters vary so that you might never know for sure if you face a weakling, an average or a champion version of the enemy. I ever hated when gamers could quote every value of a monster from the book for every single stat. I liked their faces when they laid bleeding on the ground before they realized they were not fighting enemies out of a clone factory.
You have to be careful with this, unless I've got the wrong idea from the previews combat is a cornerstone of the game; if players don't know what they are getting themselves in for to the extent they need to avoid combat altogether wherever possible it might make the game a lot less fun. In addition if the powers are significantly hard to predict you just end up in save scumming territory.
