"Kikanuile,

Once you get inside the unsealed portion of the Banewarrens, you will have to find a massive iron door. This is a warded door. It may be trapped, we do not know. It is, however, sealed beyond your capacity to breach. Therefore, you will use a wish from the ring to open it—and even that will keep it open only for a moment. On what lies beyond that door, our spells are silent, except that you will find the Vertex within Tremoc Korin. The last wish will be your key to get out.

— Yuinthu"