Gerter
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In the main castle of the Haven faction, you can build a guild up to level 5.
Wow, thanks for the tip, now it's clear what to do.
UPD. I think I figured out the reason for the Necropolis hero's stupidity in the Dungeon. Either he doesn't have the ability to summon a ship, or he doesn't want to use it for some reason. I just checked - I brought a secondary hero's ship to the exit to the surface, where the Emerald Dragons were, and he immediately ran there and started sailing to capture my castle. It's either a bug or the author's intention, but it should be fixed.
and could you comment on this, please?