I'm not disputing what's been said, but is it as simple as this? I remember, back on live server, running round the top levels of CoM without agroing anything from ground level. And vice versa, of course. And other dungeons like Befallen - the mobs on lower levels don't agro the people on the top level.
Or is line of sight involved too? And walls (and floors) block line of sight, presumably?
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