there’s a 1%(?) chance for an Epic Affix to become a Crystal Affix instead on Legend/Eternal Items if the affix is one of the 20 affixes on the Crystal Affix List. there is a Perk and a Set affix that can increase the chances of getting a Crystal affix.
@Luuuwie welcome to DQ Forums!
Your just lucky
no no! you have it wrong! the odds were against him and he beat the odds ! or RNG decided to be nice… but Luck ? I don’t know about that… .