The Transplanar Psionic Waveform Emitter, also known as a psi-emitter, is a piece of terran technology.
Psi emitters are portable machines have the uncanny ability to lure zerg to their signals. Those running the Confederate Ghost Program found that the zerg are attuned to the psychic emanations of ghosts. The emitters broadcast the neural imprint of a ghost, but at a much greater magnitude. Requiring a ghost or other psychic to be activated, they can reach across worlds, having a maximum range of around 10-25 light years. Numerous psi emitters in the same area appear to amplify the overall effect. Psi-emitters can be attuned to attract particular zerg breeds to a location.
The Terran Confederacy intended to use psi-emitters to lure the zerg into isolated containment areas. Their plan was to use the zerg to put an end to their other rivals and be lauded as heroes for coming in and destroying the zerg. However, when activated, these emitters brought the entire Swarm to the Koprulu Sector rather than the manageable numbers the Confederacy had hoped for.
One such emitter, present on Mar Sara, was acquired by Sons of Korhal engineer Merdith Jernic. She was captured by the 417th Confederate Marine Platoon, which had been abandoned by the Confederacy, and questioned by its commander, Lieutenant L. Z. Breanne. Breanne was suspicious of Jernic's story of how she acquired the device (claiming the Sons of Korhal brought it to her), and Breanne accused her of activating it. Jernic suggested letting the zerg attack the cities, while the platoon would escape with the Sons of Korhal and the emitter. She claimed the atrocities of the Confederacy forced the rebels to use the device "against further Confederate aggression". The platoon eventually activated the emitter in order to lure the zerg towards their prepared position and away from the major cities long enough for the Sons of Korhal to evacuate the citizens of Mar Sara City. The platoon was wiped out.
Before leaving Mar Sara, Captain Jim Raynor, a new recruit to the Sons of Korhal, and a rebel team raided the Jacobs Installation in order to retrieve whatever designs or weapons schematics that they could find in the Confederate networks. They download data discs and fled.
The rebels fled to the border colony of Antiga Prime. When headquarters completed analysis of the discs, shortly after rescuing and recruiting Alpha Squadron General Edmund Duke, Sons of Korhal leader Arcturus Mengsk called a meeting and had his second in command, ghost Lieutenant Sarah Kerrigan, explain that they contained designs for a psi emitter. He then had Kerrigan plant an emitter at the base camp of a large Confederate strike force which had arrived on Antiga Prime and established a base camp within their defensive perimeter. The zerg, lured by the psi emitter's signal, descended upon the unsuspecting Confederate forces and annihilated them.
Mengsk's forces traveled to the Confederate capital world of Tarsonis and had Alpha Squadron plant emitters there, over the strong objections of Jim Raynor and Sarah Kerrigan. The combined power of the psi emitters lured billions of zerg to Tarsonis. They overran the Confederacy's defenses and laid waste to Tarsonis' major cities and industrial centers.
The Brood WarEdit
During the Brood War, Mengsk, now Emperor of the Terran Dominion, was deposed by the United Earth Directorate. The UED later assembled a psi disrupter on the world of Braxis, which severely hampered Kerrigan's control over her zerg forces.
Mengsk was rescued by Raynor and brought to Kerrigan's fortress on Tarsonis. She needed his psi emitters to gather up enough zerg to destroy the psi disrupter and confront the UED. On Braxis, Raynor's Raiders destroyed the disrupter's primary power generator. With the disrupter's power cut, the emitter, carried by one of Mengsk's SCVs, was able to get the attention of renegade zerg near it, allowing Kerrigan to assert direct control over them and destroy the psi disrupter.
The Second Great WarEdit
The Terran Dominion launched a salvage operation on Tarsonis, intending to gather lost Confederate technology. Raynor's Raiders attacked this expedition, making off with Adjutant 23-46 with knowledge of the Battle of New Gettysburg. After decrypting the adjutant, Raynor listened to its transmissions—Mengsk giving the order to use the emitters to Duke, over the objections of Raynor and Kerrigan.
Raynor's Raiders eventually took control of the UNN Studios long enough to disperse the information throughout the Dominion, weakening Mengsk's rule. Dominion writings would later whitewash Mengsk's role in the use of psi emitters at Tarsonis.
The End WarEdit
A New RevolutionEdit
After the End War, a new faction arose known as the Defenders of Man under General Carolina Davis. In an effort to destabilize the regime of Emperor Valerian Mengsk, who they saw as a weak leader, they planted psi emitters on scattered Dominion colonies, which attracted feral zerg to them. The Defenders of Man then would move in to save the colonies. They were able to augment the psi emitters using technology recovered from the Moebius Foundation. Their first strike was on the colony of Antiga Prime, where they used psi-emitters specially attuned to specific specialized zerg breeds. These were planted by Dominion ghosts Nova Terra and Stone, on loan due to Defenders contacts in the Dominion, who were mislead into believing the devices were anti-zerg. However, they soon discovered that the devices were psi-emitters. Nova attempted to warn the Dominion, but was captured and mind wiped.
Nova later investigated their base at Tarsonis City, where the Defenders of Man activated one in their installation in order to scrub the facility and make sure she was killed. However, Nova slipped through them, and discovered that the Defenders of Man planned to plant psi emitters on Tyrador IX, in order to show Valerian was a weak leader. Nova swore that she would prevent this from occurring.
The Defenders of Man released psi emitters on Tyrador IX by an orbital drop launched from a viking, and feral zerg swarmed he planet. Loss of life was extensive. The Defenders of Man fleet arrived to clear out the zerg, as well as Nova's Covert Ops Crew, and between those two and the intervention of the Tal'darim Death Fleet, the feral zerg were destroyed. Nova later returned to Antiga Prime with terrazine, which allowed her to reverse the mind wipes and uncover her role in planting the psi emitters.
The One-Day WarEdit
Psi-emitters were used once again during the One-Day War on Gystt. Seeking to divert the zerg under the control of the renegade chithas under the control of Abathur from destroying the last point where the adostra were kept, Emperor Valerian Mengsk ordered the deployment of a makeshift psi emitter. This was successful in adverting a mass number of zerg under their control, but unfortunately a survey team sent to save the last point where caught by a flock of mutalisks and pulled toward the emitter. The team was able to break free, and Valerian launched a tactical nuclear missile at the emitter, destroying it and the zerg closest to the emitter.
The list of authors can be seen in the page history of Psionic technology (StarCraft)#Psi emitter.
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