Manaforge Ultris [61, 40] is one of the five facilities that "collect" the mana energies from the air of Netherstorm for Kael'thas' blood elves. This manaforge was used beyond its capacity and exploded, creating a tear in the fabric of reality. As a result, it has been taken over by creatures from the void. Before being destroyed, it had a mine underneath it that the blood elves used to supply materials for running the manaforges.
Ultris is located on a floating island northwest of Tempest Keep.