The Nailsmith

•The Nailsmith is a Merchant in Hollow Knight.
He provides a service to strengthen the Knight's
Nail for Geo and Pale Ore. He provides the first
Nail refinement for Geo only, after which he requires Pale Ore and Geo to upgrade further (see Nail for prices).

I'm not much for talk, but if its sic a nail that needs repair then you've come to the right bug.
– The Nailsmith