Light Shard

The Light Shard is a Hardmode crafting material used solely to craft the Dao of Pow. It has a 1/10 (10%) chance to drop from Light Mummies, Dreamer Ghouls, Spectral Mummies, which spawn only in Hallowed deserts.

Trivia

 * The Light Shard represents the "Yang" of the "Yin Yang" (Taijitu) symbol.