So I've been testing a theory about the AI overload on this map and it appears that depending on your potion luck towards the second half of the map you may end up with mobs ignoring you for 15-20 seconds at the beginning of the finale. I can only assume it's because of how many mob load points there are towards the end as well as the potential boss spawn at the last set of stairs. It's only a theory but it's been consistent in my multi late game potion runs. Feel free to post your results as well. Hopefully we can find out exactly what causes the issue to at least make the run fair for everyone for the time being until it's patched out.

I agree - it seems Athel is extremely consistent with AI overload, especially the finale. Which CPU do you use?

Intel i7 7700k kaby lake 4.2GHz default clock speed. It isn't a CPU issue from what I've seen. Runs I've had without movement potions at the end I get swarmed. I think there's just too many potential mob spawns at the end of that map. Here's hoping dedicated servers balances it for everyone.