Erôn-Wyntharë; which means "castle of western home" in elvish, is an ancient elvish castle that today serves as the royal citadel of Cyrendar. It overlooks the modern-day city of Wyn Falas.

The fortress was originally built by the Silvar-Elves in the early Second Age, and then abandoned when they sailed west across the Wyn Myr to the Unknown Lands. Erôn-Wyntharë was first used by King Ilnavel after his 40,000 Iskari pilgrims traveled from Iskandar to escape the "Doom." It has been expanded and rebuilt several times in its history.

Within the Great Hall of the fortress of Erôn-Wyntharë is the famous Onyx Throne.

Since it was taken over by King Ilnavel 3,137 years ago, this ancient fortress has been home to 131 different monarchs of Cyrendar: