Blacksmith Quest

One of the services you can access inside the Pocket Castle is Papi’s Smithy. A total of seven tiers of equipment can be bought here: Iron, Gold, Mithril, Crystal, Dragon Scale, Orichalcum and Prism. She starts out with only Iron Weapons and Armour, the higher tiers can be unlocked through this quest.

Similarly to Vanilla’s Inventory, Papi’s Stock gets reset when you start a New Game+. However, you don’t need to go through the process of recruiting her again, unlike the Vampire Girl.

Walkthrough
The only prerequisite of this quest is Papi being a Companion. She needs to be in the party when you speak with the Blacksmiths.
 * 1) Get the Gold Ore from Midas Abandoned Mines.
 * 2) Talk to the Midas Village Blacksmith, he’ll agree to teach Papi in exchange for a Chaos Stone.
 * 3) Get the Chaos Stone (they’re dropped by monsters from the Ilias Cont. South Tartarus).
 * 4) Give it to the Midas Village Blacksmith (unlocks Gold equipment, gives Papi the Blacksmith Achievement)
 * 5) Advance the main quest to the point where you fight Page 65537.
 * 6) After defeating her go talk to the Pope.
 * 7) Get the Mithril Ore from Mt. Saint Amos.
 * 8) Talk to the San Ilia Blacksmith, who’ll say that you need strong faith to forge Mithril.
 * 9) Recruit Sofia, Christie or Rosary (Sister Lamia, Succubus Nun and Slug Nun respectively).
 * 10) Get one of them to 10 affection and talk to them in the Pocket Castle to get the Proof of Faith.
 * 11) Show it to the San Ilia Blacksmith (unlocks Mithril equipment).
 * 12) Pay a visit to the Lizard Boss in the Saloon's Abandoned Mine, after defeating her you can take the Crystal behind her throne.
 * 13) Talk to the Saloon Blacksmith, she’ll agree to teach Papi in exchange for Star Sand.
 * 14) Get it from one of the chests at Saloon Hills.
 * 15) Deliver the Star Sand to the Saloon Blacksmith (unlocks Crystal equipment, gives First Class Blacksmith Achievement).
 * 16) Advance the main quest until you prove yourself in the Colosseum for Grand Noah Queen.
 * 17) Get the Dragon Scale Fossil from Fossil Mines.
 * 18) Talk to the Grand Noah Blacksmith.
 * 19) Get the Fighter's Badge from the Colosseum's Beginner Class.
 * 20) Show it to the Grand Noah Blacksmith (unlocks Dragon Scale equipment).
 * 21) Get the Orichalcum from Lava Mines.
 * 22) Talk to the Gold Port Blacksmith.
 * 23) Get the Dragon Forge Hammer from the Northern Undersea Temple.
 * 24) Show it to the Gold Port Blacksmith (unlocks Orichalcum equipment).
 * 25) Get the Rainbow Crystal from The World Tree.
 * 26) Talk to the Fairy's Island Blacksmith after resolving the Queen Elf situation (unlocks Prism equipment, gives Top-5 Blacksmith Achievement).