So I'm making a faction called the Draetor Empire, who are, well this.

[i]"The Draetor are an ancient race of biologically immortal humanoid aliens, rumored to be as old or even older than the Ashtar themselves, who achieved a form of energy based ascension in ages past thanks to their experiments into the nature of energy in the observable universe and several close joint research projects with the Ashtar and their psionic technology. Also, despite being structured and operated like a traditional empire, the Draetor value scientific and cultural advancement over conquest and imperialism, meaning that they are a rather peaceful race and, as such, did not participate in the Great War.

It should be noted however, that even though they are not a warlike people by nature, the Draetor still see the benefits of having a reasonably strong military presence in their sector of the galaxy and will not hesitate to go to war if attacked."[/i]

Anyway, I was thinking that instead of living on planets, they instead live on one massive hyper-dreadnought around the same size as Jupiter (possibly), which is powered by the energy siphoned from stars. And let me make this clear, the drained stellar energy would be for travel purposes only. Nothing more, nothing less. Other than that, I was thinking they move from star system to star system every hundred years or so and exchange knowledge with other races.

So, does that sound acceptable? Or is it too OP? Also, I might just limit their involvement with the Ashtar to brief interactions rather than long term research projects as I'm not certain of all the lore in play here.