The skills are the levelling system. If your Profession is below a skill, you get double XP from it.
Strength
- Berserker
- Warrior
- Paladin
- Warlord
Speed
- Assassin
- Archer
Agility
- Mage
- Archer
Defence
- Berserker
- Paladin
- Assassin
Attack
- Warrior
- Archer
- Mage
- Paladin
Magic
- Mage
- Archer
Elemental
- Warrior
- WarLord
- Mage
The max level for each skill is 150. Your overall Skill level is adding together all your skill levels.