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If Arch and Kate come, and the second hero has them, then it makes sense to build them – 20 archers in the same Crypt will be very useful, and it will be easier to break through defenses with them. I also prefer to take non-native heroes into the folders (or Turis, after all, tactics + horses). Barbarians, swamp creatures, various Gunnars and Moners, and Necropolis Warriors are good for folders (especially if Galtren or Tamika comes in the early days – it's great).