Emerald Shard

Emerald Shards are fragments of Chaos Emeralds crushed by Doctor Eggman found in Sonic Battle. They are used to operate the E-121 Phi model robots. Once and E-121 Phi is destroyed they drop their Emerald Shard and either break down or retreat. When 5 Emerald Shards of the same color are united, a Chaos Emerald can be created. Tails is the one who first discovered how Emerald Shards work and characters often visit him to have their Chaos Emerald reassembled which Emerl would soon absorb. E-102 Gamma is also seen with an Emerald Shard which he absorbs to injure Shadow.

Trivia

 * Starngely, Tails claimed that he could reassemble the Emeralds if the Shards were of the same color. However, all the Chaos Emeralds in Sonic Battle were all given a green Chaos Emerald sprite.