A Resource Pool is a Class' ability casting system. In Diablo 1 and Diablo 2 all Classes used Mana as their resource, In Diablo 3, not all classes share the same resource. A Class' Resource Pool is located in the UI, on the bottom right hand side, Usually in an Orb or Sphere.

Various Resource Pools

Mana: Mana is the most known resource pool, having been in many RPG games. It is usually Represented by a blue color. So far the Witch Doctor and the Wizard use Mana as their resource.

Restored by:
- Picking up Mana Globes
- Regeneration
- Killing enemies with specific skills
Mana Related Skills:
- Witch Doctor's Soul Harvest: Killing Enemies with this AoE Spell will restore the Witch Doctor's Mana.
- Wizard's Mana Recovery: Increases the chance of a Mana Globe Dropping.

Fury: Fury is a new Resource pool in the Diablo Franchise that only the Barbarian Uses. It is similar to the Warrior's "Rage" in World of Warcraft.

Obtained by:
- Fighting
- Presumably taking damage.
Fury Related Skills:
- Bad Temper: Slows the rate of Fury drain.
- Enrage: Increases Fury gained and Damage taken for a short time.
- Savage: Increases Fury gained after scoring a Critical hit.