Mana is the Witch Doctor's Skill Resource in Diablo 3. The Witch Doctor will need Mana to use Physical Realm Skills, Spirit Realm Skills and Command Skills. Mana is slowly replenished, but the regeneration speed of Mana can be increased by Witch Doctor Skills and Equipment.
Witch doctors’ inborn connection to the Unformed Land allows them to tap into a deep well of spiritual energy, called Mana.
Mana is a vast but slowly-regenerating resource; witch doctors must be choosy with their attack spells and hexes to ensure that they don’t leave themselves depleted of power and exposed to enemy attacks.
Since Mana returns ponderously, witch doctors conserve it by relying on semi-permanent additions to their arsenal, such as their summoned mongrels and the horrific gargantuan, which can offer protection and chew through enemies without any further mana cost.
Witch doctors have a sizeable reservoir of energy to call upon at once, and, when they need to, they can deploy immense blasts of destructive force and cut a swath across nearly any battleground in a short period of time.
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