This is my 4th purge on this PvE server. I’ve been on this server for about a week. This is the only server I’ve had a purge on since 2.8 released. This video was captured about an hour prior to posting it here.
Any thoughts on the Purge NPC AI displayed here?
Stairs - A purge NPC’s nemesis.
If they have to climb one, their code breaks. 
Yup, stairs… Oh, and also hills. And ofc flat ground. Water and umm, well yeah, actually everything. 
It seems almost like there are leaders and followers - about 4 or 5 leaders and the rest followers. Kill the leaders and the followers become - well, you’re seeing it…
I’m almost certain this isn’t actually the code model they’re using but it does kind of act like broken “swarm”. I wonder if this is UE or if this is part of their custom bits?