I guess I should have just meant AoEs in general, but my brain was stuck on DoTs.
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Wasn't there some lore where the echo is involved regarding this? I know it's the lore reason for why we can see boss mechanics such as AOE placements and all that.
I had no idea Diabolos had such a sensitive soul! This just goes to show that I shouldn't judge by appearances.
https://vignette.wikia.nocookie.net/...20140315210833