Mana

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The mana, is in a way, the energy that your character has to do any spell whether instant or attack spell.
All vocations use mana although mages use mana more than rangers or warriors due to the fact that they have more energy to do more spells.
Also, it is important to say that mages are the vocation who gains more mana each level, they gain 15 mana per level while rangers and warriors only 5.