Iron Nugget

"A dense lump of metal. This must be useful to someone!" -Description

Obtaining
Iron Nuggets can be obtained in numerous ways:
 * Chests in dungeons
 * Crates washed-up on the shoreline opened by Arfur
 * Quest rewards
 * Sold by Snorkel, the cat merchant, for roughly 300 celestial shards (not always available)

Use
It is used, along with Moebius Coal, Burnish Stone and Nova Stone, to upgrade the Hero’s Sword. Talk to the Blacksmith to do so.