I have 2 tips how I manage purges in the north (on privates):
- put fencefoundations (half hight) in front of your base.
- do equip your thralls with truncheons instead of weapons
The fence foundations will stop the purge from destroying your buildings. If they are placed low hight you can still hop over them but the purge can not. They will start attacking the fence, but since its low they won´t do much to it. It also helps against animals and bosses in purges.
Secondly equip your thralls with good truncheons (with kit) and let them knock out the purge npc´s. The reason is that truncheons stun a npc when they hit and when 2 or 3 thralls of yours hit an npc with a truncheon they are mostly stuned. This way they go down very fast.
Also I also have 4 to 5 groups of 2 to 3 thralls positioned around my base that have weapons that are fenced in. I use those for boss mobs and animals.
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