Moebius Coal

"A piece of dusty, crumbly rock that never seems to degrade" -Description

Obtaining
Moebius Coals 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, Burnish Stone and Nova Stone, to upgrade the Hero’s Sword. Talk to the Blacksmith to do so.