I also purchased a set of the "Condition Cards" for Pathfinder. I think these may be the most useful purchase of all. Essentially, these are playing cards that describe the effects of the various conditions that can be inflicted upon a character or monster. For example, if they are blinded, or nauseated, or whatever. You can hand a card to the player and have them mark it with a die or tokens or something to countdown the duration if it's a temporary condition. Brilliant and simple. Love them, and I think they will really help the players to keep track of the effects.