Dungeon Siege 2 - Level Up

In  Dungeon Siege 2 we level up in four main skills:

1. Close Combat
2. Ranged Combat
3. Nature Magic 
4. Combat Magic.

Every one of them will increase when used. So if we want to make a lot of Nature Magic levels, we need to cast a lot of Nature Magics, like Healing, Healing Wind or Zap. Stronger magics will add to level slider more. Screenshots of the game here.