Spell Points

True spell casters (Mages and Clerics, not Rangers, Paladins or Bards) are given a pool of spell points based on their level with bonus points for high statistics (Intelligence or Wisdom). Casting a spell costs it's level in points. So a 1st level Magic Missile is 1 point, a 6th level Disintegrate is 6 points. This means you can cast any spell you have memorized over and over as long as you have points left. It takes 12 hours of sleep to regain 100% of your points if you go all the way to zero. Half your spell points would take 6 hours. You can regain points at slower rates over time while walking, riding, meditating, resting, etc.