I have every Crystocrene armor piece for my hunter except for the helmet. When I tried to go to Varicks to get the challenge, he didn't give it to me, so I thought I needed to get the aged armor pieces first. When I got the pieces and went to Varicks, he still didn't vend the challenge to me. If there is another way to get the helm, please let me know.
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If you've got it before, you can get it almost anywhere in Europe, but to do this you have to complete the helmet quest once. If the problem is that you don't have the quest for the helmet, have you checked the quest archive? And please add a link to a video so you can see exactly what you mean