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Had a similar issue today, doing monolith and suddenly my framerate went from solid 120fps to 5fps and had this huge enemy group spawned
I think there was another thread about this a week or two ago - something about way too many mobs spawning - seemingly in a random fashion that made no sense. If I recall correctly, the devs confirmed that they are looking into it…
I noticed this spot as well. Most likely a spawner is spawning way too many monsters of that type. Thanks for the report.