The Mystical House of the Armor of Judgment features a Metal aligned fluffy fairy, interacting with it will give you the chance of getting Metal Essence. (Summon w/Metal Essence for Shiny Coins, worth 100 Dopcoins each.)
Contrary to popular belief, fae creechurs can handle interacting with all kinds of metals. This one covers itself with metal energies to help it deal with physical difficulties, like when it accidentally knocks things over onto itself repeatedly. It tends to feel superior towards others and will give you the judgemental side eye when it thinks you're being unintelligent.