Dark Shard

The Dark Shard is a Hardmode crafting material used solely to craft the Dao of Pow. It has a 1/10 (10%) chance of being dropped by Dark Mummies in Corrupted or Crimson Deserts. The equivalent for the Hallow is Light Shard, which drops from Light Mummies.

Trivia

 * The Dark Shard represents the "Yin" of "Yin Yang" or Taijitu on the Dao of Pow.