Cycloid Eye

 is an eye.

Obtaining

 * Dropped by
 * Cycloid

Uses

 * Used in the craft of
 * Age-Old Amulet
 * Bubotron Sword
 * Count Harebourg's Dungeon Key
 * Cryochrone Amulet
 * Jolly Good Belt
 * Sinistrofu Cloak
 * Treadfast Belt