Asteria wraiths are a unit available to Han and Horner in Co-op Missions, counting as a Horner unit and available from the Dominion starport. They are the most versatile of Horner's air units, capable of many functions at once.
Asterias have significantly improved technology compared to their regular counterparts. Most notably, Asteria wraiths use a stronger and more versatile burst laser, used for both air and ground targets with vastly improved effect and rate of fire (compared to the standard wraith used in the campaign or those used by Swann). Asterias can be upgraded to be permanently cloaked and gain double attack speed for every shot they fire, as well as tactical jump. All of these upgrades are important purchases as they improve survivability, firepower, and mobility. Asterias are overall well worth including in any army.