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From Terraria Wiki
The Light Shard is a Hardmode crafting material used in the crafting of the Dao of Pow and the Sky Fracture. It has a 1/10 (10%) chance to drop from Light Mummies and Spectral Mummies ( ) which spawn in Hallowed deserts.
On the Desktop version, they also have a 6.67% (1/15) chance to drop from Dreamer Ghouls in the Hallowed Underground Desert, and a 1/25 (4%) chance of dropping from Crystal Threshers.
Its Corruption/Crimson counterpart is the Dark Shard.
- The Light Shard represents the "Yang" of the "Yin Yang" (Taijitu) symbol on the Dao of Pow.