The one HoI4 pony mod that isn’t EaW. Translated Steam description:

Thousands of years ago, Celestia and Luna were still guarding the country and trying their best to protect the safety of ponies. Thousands of years later, the sisters killed each other and plunged the world into war.

In the end, Luna became a new threat to Equestria. The conflict between the sisters made Luna regard Celestia as a thorn in her side. An unsuccessful coup finally broke out. Fortunately, Princess Celestia obtained the Order of Harmony. With the favor of the Element, she exiled her sister who had been invaded by the Nightmare Moon. However, it seemed that she could not bear to see the tragedy of her roommates fighting again, so the Element of Harmony disappeared and ceased to exist. Celestia exiled Luna that year It was designated as the first year of the Luna Calendar. After this, Equistraia was restored a thousand years ago. Everything began to move in a good direction. Princess Celestia established the Pony Council to replace her own His sister assisted him. With the advice of the Council, Equestria carried out limited trade with other countries in the world, promoting the development of the world.