Rag's Shop is located in Valhalla. Nakajima can trade an Amethyst for a Dragon Whisker (heals the party), a Thunderbolt (damages the party), Ares' Necklace (needed to obtain the Statue of Latos in Mazurka), or the Jewel of Heaven; so long as an Amethyst is not in Nakajima's inventory, another one can be obtained from any of the Amethyst rooms. If both Ares' Necklace and the Jewel of Heaven have been obtained, an Amethyst can be traded for London Boots, which instantly teleport Nakajima to Micon, at the top of the Tower of Daedalus.