I dont know if you see them not being alive as a buff, nerf, or simply finer tuned to the lore, although I personally dont see it. I think they are almost like the elviest of elves, in the sense that I used to look at elves before FFH happend to me. As in, the technological masterrace, superior in all things intellectual, but at the same time a great deal of unfeeling, almost like the Vulcans of the Star Trek universe. And in addition to all of this, being practically immortal unless killed in combat. That is how I see the Sidar, kind of like the Eldar, kind of like the Vulcans, thinking, less feeling, immortal, isolationist. And like the Eldar, they seek destruction. They have less soul, perhaps, although I dont think they fit into the undead category. I suppose you could say their is a fine line here, especially since the Scions seem much more decadent than the Haughty Sidar. In fact, the Scions are a race so warped, they are more human than many living races, living in excess and "glory." I dont see the Sidar as demon, golem, undead, or elemental energies, I see them more like a very eccentric human/elf/eldar/vulcan. I suppose those units that are waned are no longer truly "living" although I see all the mechanics that would effect living units to effect the Sidar people as well. In that respect, I suppose living wins out.
Heh, you are right that Armageddon and Auric do not have much in common, it was my loquatious writing style that was the true culprit. Thank god I dont have to correct my sentences on forums

... but its not just sentence structure but paragraph structure entirely. It was more trying to form the will of the Sidar into written words, from my perspective of course. Those two things + they should be alive most likely should not have been as close together, however the way the Sidar look at those two events are from a purely living perspective, as in it would be harder to survive without food for one, and with all sorts of hellish energies flowing about.
Im no longer sure that they should have any resistance to death damage, because them having resistances to death damage would more strongly imply that they are not alive, while it would seem they are still alive. Oi, there is a predicament.
I suppose we could compromise by having two racial promos for the sidar. One they start with, and the other they auto aquire at level 6 or so. The first would simply be a high withrdrawal rate and immune to capture, and the second would include immunity to death magic, not-alive, and a weakness to revelation, in addition to the first one's bonuses