Does acrius catalyst only drop in the normal version of doing a nightfall or can it be obtained in GM’s as well?
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It drops from all difficulties and sometimes Xur sells it.
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Xur had it just the other week. I farmed gms years ago it took a while to finally get it
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I got it from Leviathan years ago, so I don’t know what the actual prompt is now. If it says “Obtained from Nightfalls” or similar then it can be obtained from any difficulty of nightfall
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Either from banshee 44 or xür when he sells it.