Meditation
Meditation is invaluable for anyone who uses magery. With a high enough meditation, mana becomes less of an issue. There are two modes of meditation: Passive and Active.
Passive: Passive means always on behind the scenes. If you are not at full mana your mana will regenerate all the time by iteself. The amount depends on your meditation skill. Passive meditation also regains stamina via the Healing skill. The higher your Healing skill the more stamina you will passivley regain.
Active: You have to actually use the meditation skill. While using Active meditation you are unable to perform any other action. However, your regeneration rate is double that of passive meditation.