Their purpose was to attract Zerg into isolated areas. Development of the device were performed by the Terran Confederacy during first contact with the Zerg. Due to the interference of rebels, information on the Psi-emitter was utilized by the Sons of Korhal before the Confederacy's plans could be put to effect.
- Summon Zerg Swarm - calls forth waves of unaligned zerg units to destroy everything on the map. Power of wave depends on level of weapon.
- For more information see Psi-emitter on the parent site