Most Mithril Scale pins are exclusive to the Super Rare and Super Super Rare pin ranks, making them only obtainable through the Gold Pig Gacha. There are a few pins in the Rare category, but they are extremely hard to obtain through normal play. You may occasionally get one through a Week-end Reward if you're among the higher ranking players for that week. This article is a . You can help The World Ends with You Wiki by expanding it.