If I remember correctly, Crystal sword only drops in HoH ( heros ascent last map) and high end PvE area, I've heard from sorrows furnace and from UW/FoW.
As for the rarest and most expensive item, I would say it would be a gold tryian sicle and/or the tribal axe since the white version of these weapon are actualy worth keeping (anything above 6-25 is anyways)
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