Exotic Matter is matter that possesses characteristics beyond the bounds of normal physics or are composed of non-baryon matter. Depending on the type of exotic matter it can have negative mass or imaginary mass. Negative mass matter causes strange effects to the space-time field. Imaginary mass matter cannot travel below the speed of light and can travel instantly to any point in the universe(s).
In the year 2638 large naturally occurring deposits of exotic matter composed of "strings" or string energy arcs were discovered in the vicinity of the neutron star "Schwarzschild's Star". It was found that when subjected to certain electromagnetic currents the string matter gained negative mass and would warp space-time in its vicinity.
Due to the lack of space-field sensors and proper extraction technology string matter was very rare until 3013 with the advances of high radiation shielding and space-field sensor technology. Exotic matter was first used in 2660 to develop Military warp drives capable of traveling at 2000C. These Military drives were twenty times faster than any other civilian class warp drive and were reserved solely for military vessels until the year 3014 when Exotic Matter became much more abundant. In 9952, when star-harvesting technology was demonstrated for the first time Exotic String Matter was used to create the first stable wormhole.
Imaginary Exotic Matter, or Tachyons were first discovered in the year 2684. They were used to instantly send and receive data over thousands of lightyears. Use of tachyons in information and computing technology was strictly regulated by the URSS until the year 3000 with the birth of the Confederacy. While it hasn't been invented yet, scientists hypothesize that creation of an "imaginary drive" is possible. The drive would convert a spaceship's mass into imaginary mass and would be able to instantly send the ship anywhere in the Borealis Cluster, or perhaps other galactic clusters.