The Rare Disc is an artifact that can be found by digging up artifact spots in The Mines. You can also receive it as a drop from monsters, or in fishing treasure chests.
The selling price is 300g.
You can donate this item to the Museum to increase your total amount of donations. If you have also donated the Dwarf Gadget and have donated at least 11 other artifacts, you will be rewarded with the ‘Burnt Offering’ painting.