This is based on This Topic, please read if you doubt the logic behind the idea, although i would like to keep this suggestion as a separate topic, in case there are other ideas how to balance it out
I suggest to add a form of wound to bats spawned by Purple Bats, that slowly kills them, 1hp every 5 minutes
so what would happen is that you engage the fight, they spawns their zerg big time, you run to the exit, wait few hours, and you can try it again with few more friends
presently they dont die, and you call your friends, their client crashes, they get dropped, end of adventure
we, and I believe that decent part of community community would agree, we want to have more adventures, dont take it away by not fixing balance issues, this might not be a syntax error but by the outcome it is definitely logical error and needs to be looked after
that wont nerf the power level of purple bats, and make dungeons more fun, if players lure loads of purple bats to the entrance they will have some opportunity to try again after few hours