I like very much what I see! Here are some notes on I made on the first few nations (My main criterion is internal consistency. I'm looking at them in order, will finish checking them some other time). Some of these are pretty anal, which you might be better off disregarding
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Ermor
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Innocentius: I don't suppose you can flag creatures prophets or blessed via modding commands? Maybe make him spread dominion like a juggernaut, at least, if it's possible. As it stands he's pretty bland.
Cornelius: the description begs for mapmove 1... As this hero is now, it doesn't really give anything special to Ermor, so a revision might be in order.
Multihero: These are very useful, though.
You could also reuse the Master of the Games for another multihero for EA Ermor.
MA: There are gladiators here too, so Master of Games would be again a possible multihero. Another suggestion would be an immortal shadow vestal; I liked those in Dom2 CB!
LA: Tenebrus references the Soul Gate, but you can get him even if you don't cast the global. (Right?) Also, the description says he can reanimate shadows and dispossessed spirits, but I doubt that is the case. Maybe make him an assassin, to make him something other than a poor man's Etimmu, and increase his MR to match the other LA Ermor heroes.
Multihero suggestion: I'd suggest a Mummy or a Divine Mummy; those are very hard to get normally, and cool as anything. Of course, C'tis could use them as a multihero even better. Wailing ladies might also be amusing, since you so rarely see them.
Ulm
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EA: What's so great about the Son of Steel? I'd say he needs some loving.
MA: Shouldn't Barthulf have at least E1 if he has forged his own armor? He's ways behind even Raterik as it stands. Why does Hildegaard have higher base skills than the others? Her description hints to a Hochmeister of the Black Order, but LA Ulm's Hochmeister commander specifies them as 'commanders of the Black Templars', which aren't available in the Middle Era. (The Black Knights' commanders are apparently called Black Lords.)
LA heroes are all nice. Maybe there could be some Iron Faith heroes as well, like a multihero High Black Priest with a forgebonus, inquisitor, more Holy than the regulars and a Master Smith's magics, or perhaps Hildegard.
Maverni
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I like the multihero. The name is somewhat gamey, though; How about calling them Bloodhenge Druids, seeing how there are already indies that go by that name?
Sauromatia
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An Amazon heroine would be appropriate, methinks. She could have a magical bow and high precision.
The Sentient hydra could use the same leadership as a hydra tamer in my opinion, that is, 10.
T'ien C'hi
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In LA having the same heroes as the other Ages doesn't necessarily make sense given that the old nation has been subjugated by barbarians. Why would the heroes of old aid the invaders? Making a whole new set of heroes might be a pain, though.
Caelum
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LA: Zaelinys
really doesn't belong here. One would think the raptors would put her kind to death or exile when they return. Caelos is also out of place, since the old temple guard doesn't exist anymore. To replace them, I suppose an Earthbound hero would be in line with Caelos and Isvat. They can still summon Yazatas, so an Eagle King wouldn't be out of place.
C'tis
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Niklatu: sounds like he should have reinvigoration from his rainbow armor. Also, his description says that he's the captain of the Swamp Guard, something that only exits in the MA.
Ekishnugal: you've probably alrady fixed the holy 5 this critter has to holy 4.
Udum'ukinna: He's less than 400 years old. His pops is a thousand years old...
Zilammu: she's only about 150 years old, and is consort to Udum'ukinna, who's more than 200 years older. Also, her description implies that she lived in the time of the First King, Ekishnugal, which was at least hundreds of years ago based on Ekishnugal's age.
Kabti'ili: Late Age doesn't have slave lizards anymore. The nation description also claims they do, but they don't have the troops, and neither do they have the shamen. So this one doesn't belong there.
For multiheroes, I propose for Late Age Mummies or Divine Mummies, with magic to taste. Middle Age, perhaps sentient swamp creatures who have as much to gain from spreading Miasma; Sentient Hydra might be a fun twist. Or a Catoplebas, those are beautiful. For the Early Age, maybe the mummies again.
Pangaea
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Ram's Head: satyr hoplites only exist in the Middle and Late Ages.
Taurotyrannos: Pandemoniacs are available only in the Middle Age.
Would be fun if Ambicephalos was activated for LA, and Panicratos is a swell hero also.
Timing issue: Now, this is the nitpick of the day, for sure! Namely, some heroes give information about the timeline of events, which when correlated with the age of said heroes allows one to time the length of the Middle Age.
You see, if you know that an event happens at the Early Age, the most generous assumption is that it happens at the end of the age. And if the hero that was involved in the event exists on the Late Age, and we take the most generous assumption that it's the beginning of the Late Age, the hero's age minus how old he was at the time of the event tells us how long the Middle Age is at the most. Here are the culprits I noticed from Arcos to Pangaea in the list:
Ekishnugal is the Founder of C'tissian kingdom, which has been founded already by the time of the Early Age. Yet, he's only under 1000 years old, which when gotten on the Late Age implies that MA is at the most around 1000 years long.
Mictlan's King of Legends again times the Age, being one of the first kings of the empire, so obviously from the Early Age or before... This time the result is that MA is at most under 500 years long.
Chuzrael is the last demonbred slayer, so he's lived on from the Early Ages. Thus, MA is at most 225 years.
LA Ermor Heroes reference Ermor's fall, which is apparently something that's happened in EA. Thus, looking at f. ex. Caractor's Age we know that Middle Age is less than 200 years or so long.
The easy fix would be removing any references to earlier ages from the descriptions, but I doubt that's worthwhile, and this is best ignored