Key of the Three Moons

The Key of the Three Moons is a magical item that had been split into three separate mooncrystals stashed in An'telas, An'daroth and An'owyn, heavily-guarded hidden locations throughout Quel'Thalas, each constructed on an intersection of ley lines, similar to the Sunwell itself.

The ley lines were like blood vessels of the earth, carrying magic instead of scarlet fluid. Thus interconnected, the crystals created a field of energy known as Ban'dinoriel, the Gatekeeper.

Dar'Khan Drathir told Arthas Menethil of the location of each of the three mooncrystals, who managed to open Ban'dinoriel after finding them.

Each mooncrystal had a different color, and seems to be linked with different aspects of Ban'dinoriel. The first mooncrystal, cut from the emerald Eye of Jennala, opens the mind of the Gate Keeper, the second, cut from the amethyst Stone of Hannalee, opens its heart, and the third and last, cut from the sapphire Body of Enulaia, opens its soul.