The Prototype cloak field generator was alleged to have been created by Sienar Design Systems for use only Darth Maul's Scimitar. Powered by stygium crystals, this cloaking device allowed Maul to easily infiltrate virtually any world undetected. Unfortunately, the supply of stygium was limited by the lack of supply—the crystal could only be found on Aeten II and it had a frequent burnout rate. The components of the prototype cloak field generator included a computer core, cloaking field antenna, orbital thrusters, cloaking field matrix, power conduits, and power cells.
- Star Wars: Episode I The Phantom Menace (First appearance)