Erôn-Mystarë; which means "Castle of the Elements" in elvish, was the ancient citadel of the Council of Sorcerë.

In the early Third Age, under the direct supervision of the Council, this ancient fortress was built directly into the base of Mount Orendren.

The exact location was chosen because the Synfari had discovered Mount Orendren to be the magical epicenter of Corwyn.

Atop the tallest tower of the castle, was the Meeting Chamber; a large, circular room where the entire council met, while seated around a large oaken table.

Desiring its secrets, the castle was later besieged by the armies of Alokkair in the year 252 of the Third Age. But he was defeated by an alliance of elves, dwarves, and men at the Battle of Orgorod.

in the late Fifth Age, The castle was eventually conquered by the armies of Sorimmar; who, after capturing the ancient fortress, expanded it for his own use. Once Sorimmar took control of the Erôn-Mystarë, he renamed it Erôn-Gothmar; The "Castle of Necromancy."