Take the Hovercraft to Mythril town, ride the Hovercraft to Adamant Isle Grotto. Talk to the old man to exchange the Rat Tail for Adamantite. 39.1. Adamant Isle Grotto 38. Inferno Augment (Optional) 40. Sylph Cave - Sylph Summon and Augments (Optional) Comments You need to sign in to comment on this article. Sign Up | Sign In