Gilderien the Wise was a Prince of House Miolandra, wielder of the White Flame of Vándil and the guardian of Ellesméra since Du Fyrn Skulblaka. No one was allowed to enter Ellesméra without his permission. He appeared to have an insubstantial "avatar", because he appeared to everyone who attempted to enter and disappeared when they passed. Gilderien the Wise permitted Eragon, Arya, Saphira, Orik, Lifaen, Narí, and their five elven horses to enter Ellesméra in Eldest. When Eragon and Saphira again visited Ellesméra in Brisingr, Eragon asked Gilderien with his mind if he could pass.