It should really be more accessible in end-game activities. It's not like putting it in Master/GM NFs and Trials is a freebie or some kind of handout. I just want more potential sources of Ascendant Alloy to earn instead of mindlessly farming Master KC, Master Wellspring, or Master WQ story missions.
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Nightmare Containment is the easiest source for Ascendant Alloys. At one point, I was almost full in all three postmasters from just mindlessly running them. Unless you lack the season pass for Haunted, it is the best source for farming them.