I don't know how much I really want to know about the Aldrachi, from what it says in the OP they seem really interesting, too proud to serve? How cool is that?
But I kinda feel like the less we know about them, the better, that it might be better to let players speculate and ponder upon this ancient civilization.
Kinda like the Dwemer in Skyrim. They're interesting in and of themselves, but the mysteriousness adds to it.
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Duuude! What if their greatest champions slew their own people in desperation to empiwer their weapons!
That's so cool!