Nailsmith

Found in the City of Tears at the far left of the map from the bottom. The Nailsmith is indicated by a nail sign pointing to his house near the elevator at the entrance of the City.

Nail Refinement
He'll provide the first nail refinement for Geo only, after which he will require Pale Ore and Geo to upgrade further:
 * Upgrade 1: Geo.png 250
 * Upgrade 2: 1 Pale Ore and Geo.png 800
 * Upgrade 3: 2 Pale Ore and Geo.png 2000
 * Upgrade 4: 3 Pale Ore and Geo.png 4000



After forging the Pure Nail, the Nailsmith will step outside and asks you to cut him down. Obliging him sends him plummeting down to the waters below, his corpse is not found.

This will award you the 'Purity' achievement. If you do not grant his request however, he can be found with Nailmaster Sheo and you will be granted the 'Happy Couple' achievement after talking to him.