Posts from NCF – Extended list of Neutral creatures.
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Heh. The description says that the mages FOUND the Rakshasa.
Show me where it says that!

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NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
It says they didn't find them, but summoned them. But the fact remains: Rakshasa are of natural origin.
Well, I don't know, in Might and Magic VII it clearly and openly states where the Rakshasa in this faction came from, in the campaign featuring Asad!

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
Added after 31 seconds
And the information comes from the description of the Rakshasa princesses.
Блистает там воздушностью прогалин.
Но между кедров, полных тишиной,
Расщелина по склону ниспадала.
О, никогда под бледною луной
Так пышен не был тот уют лесной...
All beastmen are of artificial origin; in the case of mixing different animals, it is explained by a different mechanism of origin (griffins, manticores, etc.) - these creatures appeared in an era when the blood of dragon gods was pouring from the sky (Urghash and his team made sure of it); the blood, falling on living creatures, led to various metamorphoses; the elder races did not yet exist in that era (as far as I understand). Rakshasas, minotaurs, mermaids, vanitzame, harpies, gnolls, and other beastmen were created by the House of Anima during the existence of the state of "Seven Cities."
Actually, the House of Anima is the home of spirit summoners (specialists in genies, elementals, etc.), while the House of Chimeras was involved in creating orcs and beastmen.
Added 16 minutes ago
Are Nagas artificial??? Does that mean the mages sold one of their creations for another - the sharkmen????
Added 1 minute ago
Regarding Rakshasas: KASPAR'S COMMENTS: "Surprisingly, after the orc and beastman rebellion, many Rakshasas decided to stay with their masters. Privileges, as well as universal fear and respect, are why the loyalty of Rakshasas remains unshakable." Source: https://mmh7.ubi.com/ru/factions/academy/creatures/rakshasa
Блистает там воздушностью прогалин.
Но между кедров, полных тишиной,
Расщелина по склону ниспадала.
О, никогда под бледною луной
Так пышен не был тот уют лесной...
The only beastmen.
They aren't the only ones; there are also gremlins! Although, I don't think they were mentioned much in Heroes 6 or 7.
Added 6 minutes later
It seems like they have some connection with goblins – that is, they are a secondary hybrid.
Блистает там воздушностью прогалин.
Но между кедров, полных тишиной,
Расщелина по склону ниспадала.
О, никогда под бледною луной
Так пышен не был тот уют лесной...
Added after 32 seconds
By the way, yes, the gremlins from the game have completely disappeared.
Sorry, the mention of Nagas was in your message above. Apparently, it was a typo.
Added 4 minutes later
Regarding Gremlins:
Well, yes, as I wrote - the original material was Goblins:
"These creatures appeared as a result of magical experiments on goblins. Gremlins are smarter and more obedient than their ancestors. In the army of Warlocks, these creatures are the most numerous. Gremlins prefer shooting to close combat, which they carry out with primitive firearms. Their clumsy blunderbusses are strong enough for gremlins to use them as steel clubs in close combat."
Source: http://ru.mightandmagic.wikia.com/wiki/Гремлин_(HoMM_V)
Блистает там воздушностью прогалин.
Но между кедров, полных тишиной,
Расщелина по склону ниспадала.
О, никогда под бледною луной
Так пышен не был тот уют лесной...