Mana

Mana or Magic point is a substance. Arcane energy is derived from the phase transitions of mana - if mana were water, then arcane would be steam pressure.

The existence and mixture of various forces and energies form powerful vortices of mana.

Mages

 * A mage can manipulate mana for defense, offense and on portals.
 * The most generalized abjuration spell is the Mana Shield (original), which transmutes raw mana into a protective barrier.
 * Mages can disenchant magical items, producing a unique form of crystallized mana which can be used to imbue other items with magical abilities.

Mana bombs
Mana bombs are bombs fueled by pure arcane energy. Blood elves had created the cursed things.

Mana creatures

 * Arcane Constructs are intelligent, but unpredictable creatures spawned of pure mana and intellect. The high elves outlawed them around 1,500 years ago, but the new era of Highborne have begun using them again.
 * Mana surges
 * Arcane wraiths
 * Mana wyrms are attracted to and feed off arcane energies. They are commonly found in Quel'Thalas around fel crystals and were used as guardians. Blood elves have been known to drain magic from mana wyrms to sate their arcane addiction. They can also be found in Netherstorm.

Manaforges
Kael'thas Sunstrider used a number of manaforges in Netherstorm to harvest the chaotic magic of the Twisting Nether. The magic was channeled to Mechanar where it was packaged into mana cells. At the manaforges, various mana creatures appeared. After Kael'thas' defeat in Tempest Keep, he used ethereals to smuggle these cells to his forces on the Isle of Quel'Danas. The Shattered Sun Offensive stole mana cells from the ethereals to power their portal to Quel'Danas.

Moonwells


Moonwells — bound to the magic of nature and the light of Elune — were places of healing for both the land around them and those who drank of their waters. Magi and other spellcasters could even refresh their mana, a gift of the Mother Moon to Azeroth's other defenders.

The moonwells hold the waters of the Well of Eternity, the ancient source of magic that has wrought so many horrors upon our world. The druids take advantage of its properties.

In the TCG

 * Mana most efficiently fills an unbroken vessel.
 * Magi are unique in their ability to store mana for future use without alchemical aid.