Passage of the Eidolons Make sure to collect all treasures. 34.1. Passage of the Eidolons The Feymarch *** Note: Rat Tail is important, you need it to exchange for Adamantite. 34.2. The Feymarch - Leviathan and Asura 34. Sylph Cave - Treasures (Optional) 36. Sealed Cave Comments You need to sign in to comment on this article. Sign Up | Sign In