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Could you please tell me what needs to be done to make level 8 monsters available in the "home" castle, where level 7 monsters have already been built and upgraded?
According to the description (see below), I can only buy a monster once – when capturing its dwelling.
New level 8 monsters
Level 8 creatures are divine in origin, so they cannot simply be hired in a castle like other units.
To add them to your army, you need to do the following: first, capture the building where they live by defeating two or three of them in battle. Immediately after the battle, you can hire one of these fighters. Keep in mind that this opportunity is only available once. After that, the monster dwelling will be empty until the end of the game.
They can be hired in any city belonging to the player, where a building for level 7 monsters has been built. The number of level 8 monsters available for hire depends on how many of their dwellings are scattered across the map and belong to the player. If you do not hire all available level 8 monsters this week, they will simply disappear at the start of the next week and will not be added to the newly spawned ones. Note that a level 8 monster can only be hired in a building for level 7 monsters.