Nova Stone

"Shines as bright as the sun in the sky." -Description

Obtaining
Nova Stones 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 Iron Nugget, Moebius Coal and Burnish Stone, to upgrade the Hero’s Sword. Talk to the Blacksmith to do so.