Unbidden

Extradimensional Invaders, more commonly identified by their three main subspecies or factions the Unbidden, the Vehement and the Aberrant, are a sapient race of living ethereal energy from an unidentified extradimensional realm.

These Extradimensional Invaders are an extremely aggressive race, relying on the invasion and harvesting of organic-inhabited galaxies (termed "Hunting Grounds") across a variety of alternate dimensions: Once a galaxy develops a certain critical mass of organic population, powerful Dimensional Warlocks will attempt to breach the fabric of reality separating said galaxy from its dimensional neighborhood to allow fleets of Extradimensional vessels commanded by Fleet Lords and consisting of Escorts, Cruisers, and Battleships to enter the material realm. Any diplomacy or other sort of higher communication with the Unbidden is categorically impossible, Extradimensional fleets will almost immediately begin attacking all organic life without discrimination, "harvesting" any inhabited planets from orbit and engaging any hostile spacecraft on sight; Total galaxy-wide annihilation of all life can only be prevented by complete extermination of all Extradimensional constructs with extreme prejudice.

Due to their incorporeal natures it is immensely difficult to differentiate between Unbidden "individuals" (if such a concept is applicable to the species) and their energy-constructs, it is entirely possible that Unbidden vessels are merely individuals of specialized castes within a larger Gestalt existence. They appear to have a universal affinity for all forms of Subspace transportation; distribution of jump drive technology within a target galaxy can accelerate the process of opening a Dimensional Portal by decades, while Extradimensional fleets can bypass FTL inhibitors, employ Dimensional Stutter or Ethereal tactics in combat, and erect powerful Dimensional Anchors to strengthen their parent Portal and exponentially increase the rate of their expansion. Unbidden are not psionic per say, but have a certain affinity for psionic civilizations and describe their original plane as being adjacent to the Shroud.

Despite their level of existence being effectively indescribable in organic terms, Extradimensional society has been seemingly shattered by some sort of succession crisis, splitting the Invaders into three factions or subspecies that engage in both conventional warfare and resource denial during galactic invasions.