Stealth

I think it would be cool if you could actually sneak past enemies with variables that affect a players detection. Their sight would work like a players view, with only a certain viewable angle. There could be a hearing radius where if a person does something loud like run or use heavy armor they will notice the player. This could have players favor leather armor and allow making hunting passive creatures harder. It would allow a whole new variable to combat and a new reason for armor other than diamond.