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then you could do it like this:
Haven - angel and dragon
Academy - phoenix and mystic eagle
Necropolis - fallen angel and bone dragon
Dungeon - Naga General and Kirin
Inferno - demons and ?
Fortress - golems and giants
Stronghold - hydra and great basilisk
Northern Clans - stone giants and cyclops
and this will give us the opportunity to create a third unit for each faction or seven neutral units
When we were discussing "symmetry" with you, I was confused by the fact that in the case of campaigns or story maps, when there are events or scripts tied to level 7 creatures, we might get some kind of nonsense (or some kind of inconsistency with the plot). And also, for example, if Haven has angels and dragons, will it be possible to transform an angel into a dragon and vice versa in the creature upgrade window (as we do with the upgrade and alt-upgrade of creatures) - this is clearly bad.