During the mid-23rd century, an alien race of unknown origin traversed through known space, attacking selected targets to test their defenses to ascertain whether or not it was worth conquest. To achieve this, the species sent out scout fleets that located and attacked potential targets, such as the Gaim or Babylon 5. The survival of such fleets against potential targets is what decided whether or not they were worth the resources to conquest, making it necessary for the targets to destroy most, if not all of the fleet.
In 2262, this species attacked Babylon 5 after encountering the Gaim sometime before, the latter of which were able to warn Babylon 5 in advance of the scout fleets arrival. Ships belonging to this species destroyed long range probes sent out into hyperspace by Babylon 5. Afterward, an initial wave of ships traveled through the jumpgate and attacked Babylon 5 and the launched Starfury's and were destroyed though combat. Later, the species arrived with the main fleet, attacking the station with cruisers, fighters that could damage B5's hull in a few hits and breaching pods.
The species was a Bipedal Humanoid that did not breath oxygen, wearing suits of armor that covered the entire body, including the head. They could also be influenced by Human telepaths to the point where they ignored intended targets and moved on.
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