[member="Ugohr Poof"]
When there isn't much to go off of as far as societal, cultural, or psychological information then there is plenty of room to mess around with the baseline and still stay true to the species itself. With the physical/biological description you can make an inference as to the other portions. Now you bring up a Polydroxyl as an example. After reading over the short description on Wookie, it would actually be rather easy to physically break such a species. Not through one singular hit most likely(unless it was a devastating one), but through attrition. Keep up a constant stream of physical damage and eventually it will die as it can no longer repair the damage. This could easily be done in a myriad of ways. Sonic,(especially through the use of resonant frequency), heat, cold, opposing magnetic fields pulling it apart, etc. The list seriously goes on for the physical realm.
Also if you had read my comment, I never said differing species would break the same, nor that they would recover in anything of a similar fashion, and it wasn't even an implication. I was making the point that there is going to be reasonable variation based on each individual within a species, which is why I mentioned the experiences of the character. I was saying that there are various means with which to break any species, both physically and mentally. And what you mention about Dunames is one reason that I feel no real compulsion to read her posts. Even if they are well written, I already know that based on what you just said she is going to be an arrogant, self centered, money hungry queen in the thread. Oh and she can apparently fly different ships. Great, really shows a lot of depth. If you are that scared to have her face anything resembling a challenge then I would dare say that it is a boring arc with little place to go, especially if you refuse to push her to a point where she is feeling like she has to question anything about her possible flaws and/or weaknesses.
To address your final point here, you can have an extremely deep universe, tons of other fluff that is developed( from the caste system of every planet to socioeconomic climate including taxes, imports, exports, fees, the cost of living, to the geography inherent to every single biome of each planet in the galaxy and how the temperature differential effects life there) but what makes a story worth reading and memorable are the characters. So give me the basics on the background, and add to it as the story continues, but focus on the ones who inhabit this wonderful galaxy and the challenges they have faced that made them who they are. Then work on keeping them interesting by letting them be challenged in the future as well.