Uhh yeah, I guess no one knows where they drop?
Do wraiths still drop them, or is there a new place to farm for dc ores?
I don't remember exactly which it was but one of the golem types drop dark crystal ores. I think it was Dark Stone Golems.
.......
Afaik, post-bb you can get them from Yetis.
Or buy them in the free market for about 100,000 mesos each.