Talk:Wolf of Scarlet Woods/@comment-89.151.209.68-20140725154139/@comment-188.124.217.137-20140726020208

You get one as a reward the first time you clear the 5* quest.

You can also get one from evolving 9 Magical Iron Keys, which drop from chests in the 3*, 4* and 5* quests (or you can evolve 9 regular Metal Keys to get one Magical Iron Key).