Board Thread:Warhammer 40k General Discussion/@comment-7699236-20130626164907/@comment-6078851-20140222015320

@ lucario,

they wouldn't be using imperial technology or astartes biology, they would have learned how to create such, initially from the imperium but then under their own scientific processes, and, obviously, such would be tailored to their own race.

and you forget that the eldar's primary goal of existance is to thwart chaos and necrons. and while there are divisions of the eldar that would totally let the galaxy burn my theory was based on one of the factions that can see past the racial arrogance to the big picture. if the galaxy was under the control of chaos or necrons then it's not only feasible but extremely likely that they would aid the imperium in such a scenario.