A Crystalline Lifeform that Inhabits Droids
Shards were a silicon-based species native to the planet Orax, who took the form of irregularly faceted cylindrical crystals thirty to forty centimeters in length. Faint pulses of light—thought signals propagating through their "brains"—could be seen inside their bodies. Shards were immobile in their natural state, but could be installed in specially modified droids.
“Jack” was part of Gunther Loronar’s experiments, a small simian synth droid named Jack. Gunther had likely put the crystal into the synth droid to link it to the Crystal Network, not realizing that in was a fully sentient entity. The test subject subsequently escaped the lab and joined up with Sage and Kamahl.
They transferred the Shard, killing the simian host body. The new body was a 3PO unit. However, Jack was ambitious to have a more combat-oriented chassis, and went to work on acquiring a super battle droid body.