Posts from RTF is a global modification that replaces all towns in the game.
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Do we need Ashan?
The triquetra is too similar to the symbol of the Sylvan faction. In fact, they are almost the same.
Added after 41 seconds
I think the triquetra would be a great fit for the elementals.

In Heroes of Might and Magic I, the Sylvan faction's symbol was a leaf.
The icon of a faction displayed above a town is one thing. The official symbol of the faction within the Ashan universe is another. In my humble opinion, it's best to avoid duplicates, although this depends on how closely you want to adhere to the established lore.
What about this one?
Yeah, this symbol is better!

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
Faction Sketch
Goddess: Chimera
Country: Name unknown, known as the "Chimera Magi"
Capital: Morok
Symbol: Skull
Main colors: green, yellow
Lord: Letos
Main magic: Darkness, Chaos
Class: Inquisitor (in a distorted sense)
Army:
1. Undead/Restless/Decaying Undead
2. Harpies/Furies/Raiders
3. Chimera Guardians/???/???*
4. Centaurs/Centaur Captains/Centaur Rogues
5. Warlocks/Sorcerers - based on Druids
6. Minotaurs/Minotaur Guardians/??? - 2x2
7. Monster/Ancient Monster/???
* Chimera Guardians - approximate image - https://ubistatic-a.akamaihd.net/0004/prod/images/units/academy/academy_faction_art.png
City - redesigned Elven city]
It would also be helpful to have a to-do list and a done list for the main details. This way, visitors can see what is being worked on and how it is progressing, and maybe someone can help with something.
If your mod involves replacing all cities (including those of the Sylvan faction) and you don't intend to adhere to the lore of Ashan, then please feel free to use this symbol as you wish; otherwise, THIS IS PURELY AN ELVEN SYMBOL, and there's no need to copy it.