What is Antirust? I could easily clear any Mythic Antorus bosses besides Eonar solo with ~normal ilvl on any alt during sesaon 4 btw. But yeah, I'm not even sure you can do N'Zoth solo right now because he may just reset if you go down into the vision phase without anyone else staying up?
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Solo Eonar is possible if you have the right class, but it sucks. I just did the raid four times on all chars with randoms, got the Eonar loot I need and finished the skip that way haha.