I searched the forums but found nothing about the resonance gems. I have 3 currently and the two that are supposed to get from the reaver inside the dwarven construct are not there. One reaver had 2 of the same spell books and two pieces of beef so I would think the coding was halfway right, just not on the right item. Are there any more resonance gems anywhere, then? I really do not want to have this quest locked out for me.

I believe there are only 5. I have found no more than the 5 but you really only need 4.

Yeah, I have the three, but a reaver lord never showed up for me! This svcks! I hope it is fixed!

I found that they respawn in Falhbtharz.