Magic
Meditation
Meditation is the mage endurance skill. It does nothing in the moment of a fight and everything between fights — the higher it goes, the less of your time is spent standing around waiting to be useful again.
Meditation trains passively while your mana refills. Out of combat it refills twice as fast, which is where the skill earns its reputation.
Meditation sets the rate; Intelligence scales it. At 100 Int you get the full curve, at 25 Int a quarter of it — so a warrior who dabbles in magic recovers mana far more slowly than a real mage, whatever their Meditation. Bless counts here too.