Naturally, only the Domains that you've unlocked will be accessible to you. There are no prerequisites or special Event Quests required to start getting the double drop rate bonus. Simply head to your Domain of choice to start farming. Related:Where to find all Safhe Shatranj Chess Pieces in...
other artifact sets with optimal sub-stats, they may also want to consider utilizing only 2 pieces of the Golden Troupe set alongside 2 pieces of Thundering Fury. Additionally, equipping Thundering Fury as a 4-piece set or pairing it with EM or ATK set bonus pieces remains a viable option....