Pantheon- Slavic
Places of influence -
Eastern Europe (Russia/Belarus/Ukraine) , large portion of central Europe (Poland/ Slovakia) and most of southern Europe (Serbia/Bulgaria/Romania).
From Siberia in the East to parts of Germany to the west.
Also has some dealings in the middle east (Kazakhstan/Turkey). And even small presence in North America (the northern states/Canada)
Organizations-
The gods of the Slavic pantheon puts heavy emphasis of duality. To the Slavic gods the world(s) is or with their seemingly opposite yet complementarity duality.
The Slavic gods come together to makes major decisions, with final decision belonging to Perun the God of the sky. The slavic gods will elect representative from the different factions among the themselves to lobby Perun.
The Slavic gods travel and inhabit the 3 (main) worlds, the heavens, world of the living(Earth), and the under world. Interestingly enough the Slavic underworld is actually described as being pretty nice place, with green meadows & endless springs.
The Slavic gods mostly operated either their own or with a partner. As long as they do nothing too damaging, or attract too much unwanted attention . Most other gods will turn a blind eye.
The Slavic gods adopt aspects from neighboring Parthenons, including the Romans, Norse, Persian, even hindu. Making them pretty adaptable, even to the modern day.
The mortals of the Slavic pantheon , have a city that change location every few decades. Is now currently somewhere in Central Europe, either East Germany or Austria. The city in modern times takes the form of a vacation or resort city.
Kresnik-
There is an organization within the mortals, called the Kresnik named after the God of the same name. They operate as a guild of monsters hunters & adventures ,who patron is the Kresnik a warrior God with dominion over fetility. They hunt vampires, Topielec, Azdaja and other Slavic monsters.
The members of the Kresnik hunt monsters for money or fun(mostly both).
Races-
Demigods -
Your already know what they are.
Zmajeviti- .
Race of half Dragon people, who look very human. But in danger or under stress, will take on more Dragon like features. They can be either good or evil. They may act as guardians or guide to certain humans or demigods.
They can take on the powers of a European dragon, flight, fire breath, durability and strength. They can be hired as bodyguards or mercenaries.
Friendly Zmajeviti can even ward off bad weather .
Vila-
Also known as Veela, race of female spirits similar to sirens/Hulu jing/Kitsune. Who possess supernatural charm in both beauty & words, and some control over the elements (weather). They also can have healing abilities, their singing is said to enchant those who hear them.
They highly value freedom and generally good natured, know to help heroes on their journey. Despite this they can be dangerous, if pushed far enough.
Strangely if a Vila dies of natural causes/choice, a younger infant version of them may appear. Under certain conditions, like a Phoenix if a Vila dies, she may be reborn from her old body.
Note: both Zmajeviti & Vila have been know to marry humans/Demigods. It is possible for Children to be born from this type of union.
Powers -
Demigod abilities -
A person with a godly parent will gain some of the same abilities of their parent.
Blessing of Kresnik -
Is given to Bogatyrs, who are the higher rank members of the Kresnik. Those who have earned the blessing of their patron, similar to Artemis blessing.
They will gain enhanced strength,stamina, senses, faster healing and a purifying ability.

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Pantheons Of the Riordanverse
फैनफिक्शनDescriptions on how new pantheon may work & coexistence in the Roiden-verse. As long as you credit me, feel free to uses the description in your own stories. Prepare for incredibly long updates. P.S - NOT EVERYTHING MYTHOLOGICAL HAS TO TAKE PLACE I...