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When do monster auras change?
I didn't realize until recently that sometimes a given aura-enchanted boss will change its aura. It doesn't seem to happen often but I know I've seen it a few times, usually after going back to town and coming back after a while. For example, a Holy Freeze aura-enchanted boss will change into a Fanaticism aura-enchanted boss- something like that with all the mods the same. Does anyone know under what circumstances such monster auras can change?