Rare Disc
A heavy black disc studded with peculiar red stones. When you hold it, you're overwhelmed with a feeling of dread.
Overview
The Rare Disc is an artifact that sells for 300g and can be found from several sources throughout the game. It is dropped by Bats, Shadow Brutes, Shadow Shamans, Shadow Snipers, and Spiders, can be given by a pet dog with maximum friendship, and can also appear inside Fishing Treasure Chests and Artifact Troves.
Like other artifacts, donating a Rare Disc to the Museum counts toward the total number of museum donations. It is also one of the items needed to earn the Burnt Offering reward, which requires donating a Rare Disc, a Dwarf Gadget, and at least 11 artifacts in total.
The Rare Disc also has a tailoring use: placing it in the spool of the Sewing Machine produces the Navy Tuxedo.
Official description
A heavy black disc studded with peculiar red stones. When you hold it, you're overwhelmed with a feeling of dread.