arscott said:
you could always combine the idea of exhaustion with mana points:
Mana bascially represents energy you have to spare for spellcasting. After you run out of mana, you can push yourself and use the remainder of your energy which comes out of hitpoints, strength, or constitution.
Just thought of this, and figured I'd share:
MP system. You have a total MP which depletes. Once you're out, you are fatigued, but the MP replenishes. Once it runs out again, you're exhausted, but the MP fills up again.
While Fatigued, each spell costs +1 MP; while exhausted each spell costs +2 MP. I would personally like some randomness to it as well, so a spell might cost:
1d4 + lvl*2 + fatigue/exhaustion modifier
That way you never know exactly when you are going to run out.
If you cast beyond your Exhaustion points, you can make a Fort save (DC how many points you have spent since done with exhausted) or die.
It's still something to keep track of, though. I'd prefer a system that didn't have points at all, fo even greater simplicity.
The one I use has a save rolled every time a spell is cast, and every time you fail the save the DC goes up. At a certain point, you can die. But in this one, you still must keep track of the current penalty (though it's not as much to keep track of), and you must roll a save every spell cast, which is a bit of a pain.