I'm pretty sure I'm aggroing mobs through the floor on the first floor of Kurns.
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I've been camping in the unmarked room on the right side of the first floor. Occasionally, when fighting in that room I would have a whole mess of Burynai crashing in on me ruining my day. I thought I had just been trained so i moved my spot further into the room. It happened again a few clears later so I moved in all the way to the little alcove in the far southeast of the room. Right after I engaged a mob, i sat down to med a little in that alcove and all of my burynai friends came to eat me. I feel like I was way too far away from the door for it to have been a train this time and I'm 99% sure i'm aggroing mobs through the floor/ceiling. I'm getting at least one each of sappers excavators and burrowers. Not sure if this is something you're interested in fixing, just thought I'd let you know.