I faced it too, till i could figured it out, i though that it should be a mechanic to avoid spamming purge infinitelly, but i was tottally mistaken. Purges lvl 1 to 7 are quite easy, you just have to take care with the camp, defensive archer are tough, if the purge camp spawn close to base they will kill our thralls, another factor are the purge camp guards with spears, they are one skull mini bosses and they are 6, they will attack if you get to close to the camp and they can ruim your purge, they are incredible strong. I had the sensation that the purge lvl 1 had the incresaed difficult, but on thrut i have come to close to the camp and trigged these guard, and while i was trying to survive them the others loot the coffer and destroyed the base.

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