there is a chance for Legend & Eternal Items to be found with a Crystal affix as Loot or when bought in the LegendEx with Dust, but only if the Item originally has at least one Epic affix that is on the Crystal affix list.
when Farming for Eternal Items with a Crystal affix, high Luck, Treasured Perk, Crystalline & Eternalized Sets will help a lot.
if using Dust, Crystalline Set & Treasured Perk should be equipped when using Dust to increase chances of having the bought Legend/Eternal Item having a Crystal affix. just make sure the Item has an affix on the Crystal affix list.
here is a list of Crystal affixes and their values. most crystal affix values are triple their Epic versions.
Attack Speed +45%
Reduced Cost +45%
Reduced CD +45%
Critical Chance +45%
Critical Damage +225%
MP Regen +1500
HP Regen +1500
MP on Hit +500 - (for some reason, these 2 are only doubled,
HP on Hit +500 - I guess it’s for game balance reasons)
Gold Find +225%
Luck +225%
All Resist +750
Total HP +75%
Total MP +75%
Armor +7500
Dodge +30%
Block +45%
Crushing Blow +30%
Deadly Strike +30%
Weaken +90%
these are the max values. values will vary from 75% of max to max on Legend or Eternal Items. on Normal to Epic Items values will vary from min to max.