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Data Cross-checking
Fragment of a discussion from User talk:Snowie/Celtic Weapon Material Drop Locations
The two emblems and the lightless fragments come from everywhere, to my observation. My chart also contains translated data from Mabinogi KR, for reference, although I haven't seen anything special in just hardmodes yet so it's possible that those really only have the lesser materials.
The other things on the list are from personal experience and from whatever my friends/acquintances manage to find.