dont think it depops anymore; prepatch it seemed to do about 3-4 laps in the mushrooms then depop (at least when I was spamming shroom NM)
The other week postpatch it was up for hours... well until we decided to kill it.
I'd almost want to pretend its a dominion style pop (just no npc to say %) Try killing the shrooms+NM and bombs+NM as well as ephemerals and avatar. Most seem to be semi related to the surrounding mobs. Or hell... it could be tied to bastion
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