They can join strong troops: gargoyles to the left of the starting village; upgraded dwarves near the wood mine closer to the center of the map; wolves standing in the passage to the Barbarian zone closer to the center of the map; and some other troops, but I don't remember.
2. Walkthrough.
I placed the Castle on the fourth day, although with an ideal walkthrough, you can do this on the third.
By the way, my hero finished without a spellbook:)))
By the way, a question: Has anyone tried leveling up a Necromancer? Since this project gives you magic to raise the dead... which is very good....
I only thought about this at the very end of the game, so there was no time to refine this option :(