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Manaforge Coruu is one of the five facilities that 'collect' the mana energies from the air of Netherstorm for Kael'thas' blood elves. It seems that the blood elves did not build the buildings but only conquered them. Manaforge Coruu is also the base of Spellbinder Maryana, one of Kael'thas' lieutenants.
Coruu is located on the southernmost floating island of Netherstorm.