Build smart. Create choke points with a clear path. You want a cull de sac at the entry so your thralls face the npcs with vantage. Use natural terrain and ruins as cover. They can’t demolish that or climb. Start making heavy armors that buff health and slap them on thralls. Use potions and food to buff them. Abuse bulk plating. Make potions for yourself too. Now it’s the time for those expensive ones. That’s the best use you can give to the scales you got from the sunken city . Place a bedroll and a chest with an extra kit, health potions and buffs in case you die.
Use palisades wisely.
Heal thralls between waves.
Most important, keep your cool. Don’t go crazy when fighting. Good luck!

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