Sly

Initially found in a small hovel in the room accessible after defeating Gruz Mother in the Forgotten Crossroads, slowly succumbing to the infection. Talking to him breaks him out of his daze, and he will return to Dirtmouth to open his shop.

After given the Shopkeeper's Key, more of his goods will be unlocked.

Visiting him after learning all three Nail Arts, he will be found in his storeroom, where it is revealed that he is the Great Nailsage who taught the three Nailmasters and rewards the player with the Nailmaster's Glory Charm.





Trivia
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 * According to a livestream Q&A, the development team originally planned for Sly to be a difficult boss who wielded a nail approximately the size of the other Nailmasters'.
 * Sly being more than he seems is repeatedly foreshadowed. For instance, his very first line - "Oro, you oaf... you wield your nail... like a club..." - refers to Nailmaster Oro, he states that he is "usually Sly", and he comments on the player's Nail several times.
 * Sly is the only merchant that requires the player to purchase an item to unlock the next one in the series.