Ancient Era:

Sintashta (Militarist)

LT: Fortified Center

• +1 Combat Strength in combat for Units in or adjacent to Garrison 
• -30% on Garrison Industry cost

EQ: Arkaim (It's a Garrison that can be bought with Influence)

• +1 Combat Strength in combat for Units in or adjacent to the District
• +1 Industry per Copper
• +1 Food per Horses
• +5 Science per adjacent Strategic Deposit
• +5 Stability 
• +10 District Fortification
• Count as "Garrison"
• Is: Land Unit Spawn.
• Is fortified.

EU:  War Chariot (Unlocks in Domestication)

• It's a Melee Cavalry unit with 20 Combat Strength and 6 Movement Points. It requires 6 Horses and it has "Multi-Move", but it requires more production.

Classical Era:

Great Moravia (Aesthete)

LT:  Cultural Crossroad

• +5% Influence per Independent People controlled or assimilated
• +10 Influence per Independent People next to your Territory 

EQ: Great Moravian Castle

• +1 Combat Strength in combat for Units in or adjacent to the District
• +5 Stability
• +10 District Fortification
• Exploits Food
• Exploits Industry
• Count as "Garrison"
• Is: Land Unit Spawn.
• Is fortified.

EU:  Hussar (Unlocks in Mounted Warfare) 

• It's a Cavalry unit with 27 Combat Strength and 7 Movement Points. Can move after attacking.

Medieval Era:

Kievan Rus' (Merchant)

LT: Russkaya Pravda 

• +2 Gold on City or Outpost per Number of enacted Civics
• +2 Stability on City or Outpost per number of Trade Routes

EQ: Trade Post

• +1  Food per Traders on City or Outpost
• +1 Money per Farmers on City or Outpost 
• +5 Money per adjacent River
• -10 Stability
• +1 Farmers Slot on City or Outpost
• +1 Traders Slot on City or Outpost
• Count as "Farmers Quarter"
• Count as "Market Quarter"

EU: Druzhina (Unlocks in Feudalism)

• It's a Melee unit with 32 Combat Strength and 4 Movement Points. It gives +2 Combat Strength to adjacent units.

Early Modern Era:

Muscovites (Expansionists)

LT: Third Rome

• +1  Food on Capital per State Religion Follower
• +1  Industry on Capital per State Religion Follower

EQ: Kreml' (must be placed on Main Plazas or Administrative centers)

• +2 Combat Strength in combat for Units in or adjacent to the District
• +10 Stability
• +10 Fortification
• +5 Fortification on City or Outpost 
• Count as "Garrison"
• Acts as "Main Plaza"
• Acts as "Administrative Center"
• Is: Land Unit Spawn.
• Is fortified.

EU: Streltsy (Unlocks in Gunpowder Warfare)

• It's a Gunner unit with 44 Combat Strength, 4 Movement Points and a Range of 4. +1 Combat strength for each Movement Point remaining during its turn.

Industrial Era:

Serbs (Militarist)

LT: Unbreakable Spirit 

• +1 Combat Strength on Damaged Units for each war declared
• +5% FIMS on City for each war declared

EQ: Serbian Orthodox monastery (temporary name)

• +1 Influence per Farmers on City or Outpost 
• +1 Faith per Farmers on City or Outpost 
• +3 Food per adjacent Farmers Quarter
• -5% on Unit Industry cost (when at war)
• Count as "Farmers Quarter"
• Count as Religious District

EU: Serbian Conscripts (temporary name, Unlocks in Nationhood)

• It's a Gunner unit with 46 Combat Strength, 5 Movement Points and a Range of 4 . As Abilities it has "Home Guard" and "Stealth".

Contemporary Era:

Yugoslavs (Aesthete)

LT: Non-Aligned Movement

• -50% generation of passive War Support that other players have against you

EQ: Federal Assembly

• +1 Influence per Workers (On City or Outpost)
• +1 Stability per Number of enacted Civics
• +1 Workers Slot on City or Outpost
• Count as "Commons Quarter"

EU: Partisan Brigade (Unlocks in Insurrection Theory and is cheaper than Commandos)

It's a Gunner unit with 54 Combat Strength, 5 Movement Points and a Range of 4 . It's a Stealth unit that is stronger in friendly territories.

Natural Wonders: 

Man'pupunёr

Description: The Man'pupunёr rock formations, also known as the Seven Strong Men Rock Formations, rise majestically in the Ural Mountains, casting a shadow of enigma and wonder over the surrounding landscape. They can serve as powerful symbols of strength and unity. 

Effect: Gain a significant boost to defensive capabilities and diplomacy bonuses when controlling the region where Man'pupunёr is located. These monolithic sentinels inspire awe and respect among people, making it easier to form alliances and negotiate favorable diplomatic agreements. 

Mount Elbrus

Description: Mount Elbrus, the highest peak in Europe, has long been a source of inspiration for mountaineers and philosophers alike. Its towering presence can elevate the quest for knowledge and culture.

Effect: Gain a significant increase in science and culture production in the territory where Mount Elbrus is located. The scholarly pursuits and artistic endeavors inspired by the mountain's prominence will accelerate the civilization's advancement in these domains. 

Plitvice Lakes

Description: The cascading waterfalls and crystal-clear lakes of Plitvice Lakes are a testament to the beauty of nature. This natural wonder can promote harmony and prosperity. 

Effect: They provide a substantial boost to happiness and population growth. The serene and breathtaking environment of the lakes ensures that the people are content and thriving, contributing to overall prosperity. 

Cultural Wonders:

Bol'šoi Theatre

Description: The Bol'shoi Theatre, a bastion of classical Russian ballet and opera, has stood as a symbol of artistic excellence for centuries. This renowned cultural institution can ignite a cultural renaissance. 

Effect: It significantly increases an empire's Influence output, inspiring people to create masterpieces, attracting tourists and scholars from around the world to experience the richness of your culture. 

Hermitage
Description: The Hermitage Museum houses an unparalleled collection of art and historical artifacts. This repository of knowledge and beauty can stimulate intellectual and cultural growth. 

Effect: It provides a substantial boost to the science and culture production. Its vast collection serves as a wellspring of inspiration, propelling your civilization to new heights of learning and creativity. 

Saint Sophia Cathedral

Description: Saint Sophia Cathedral showcases the magnificence of Byzantine architecture. This cathedral can become a beacon of faith and grandeur. 

Effect: It grants a significant boost to faith production and importance. Its awe-inspiring design and spiritual significance inspire unwavering devotion among your people, while also incentivizing the construction of other religious buildings (it gives +50 Fame for all the new Religious Wonders/Holy Sites that you will build). 

AI Persona: Ivan III Vasil'evič (Cool Headed, Expansionist, Patron, Megalopolist)

A1y0sh4 wrote:

Ancient Era:

Sintashta Culture

LT: Fortified Center

• +10  Fortification on City or Outpost
• -25% on Create Outpost cost (It's the current russian LT wich doesn't really fit in the 5th era)

EQ: Sintashta Settlement

• +2 Combat Strength in combat for Units in or adjacent to the District
• +10 District Fortification
• Creates a new Deposit of Copper which is automatically exploited.
• Automatically upgrades regular Outpost
• Is fortified.

EU:  War Chariot (Unlocks in Domestication)

It's a Ranged unit with 21 Combat strength, 6 Movement Points and a Range of 3. As Ability it has "Move and Fire" and requires 2 Copper and 1 Horse.

Unexpectedly and pleasantly) If you are interested, I also developed the culture of Muscovites

A1y0sh4 wrote:

Ancient Era:

Sintashta Culture (Militarist)

LT: Fortified Center

• +10  Fortification on City or Outpost
• -25% on Create Outpost cost (It's the current Russian LT wich doesn't really fit in the 5th era)

EQ: Sintashta Settlement (Maybe instead of an Outpost it can be a Garrison that can be bought with Influence and that would count even as a Makers Quarter and get a bonus from near discovered Strategic Resources, maybe one of Science and Industry)

• +3 Combat Strength in combat for Units in or adjacent to the District
• +10 District Fortification
• Creates a new Deposit of Copper which is automatically exploited. (Only if the District has been built after having discovered Bronze-working)
• Automatically upgrades regular Outpost
• Is fortified.

EU:  War Chariot (Unlocks in Domestication)

• It's a Ranged unit with 22 Combat Strength, 6 Movement Points and a Range of 3. As Ability it has "Move and Fire", and requires 1 Horse.

Classical Era:

Antes (Agrarian)

LT:  Gifts of Nature

• +2 Food on River
• +2 Industry on River

EQ: Turris

• +1 Combat Strength in combat for Units per number of Alliances (all units in the territory are affected by this bonus. Allied units just get +1)
• +10 Stability per number of Alliances
• +20 District Fortification
• Count as "Farmers Quarter"
• Count as "Makers Quarter"
• Count as "Garrison"
• Is: Land Unit Spawn.
• Is fortified.
• Can be built only if you have at least one Alliance.

EU:  Antes Warrior (temporary name. Unlocks in Standing Army, they have the same cost of a Gaesati) 

• It's a Melee unit with 26 Combat Strength and 4 Movement Points. As Ability it has "Ambusher".

Medieval Era:

Kievan Rus' (Merchant)

LT: Russkaya Pravda 

• +2 Influence from every Religious District (or maybe "+1 Influence from every Trade Route") per number of Alliances
• +2 Science from every Religious District (or maybe "+1 Science from every Trade Route") per number of Alliances

EQ: Trade Center (maybe rename it in "Fair")

• +1  Food per Traders on City
• +1 Gold per Farmers on City
• +5 Gold per adjacent River
• -10 Stability
• +1 Farmers Slot on City or Outpost
• +1 Traders Slot on City or Outpost
• Count as "Farmers Quarter"
• Count as "Market Quarter"

EU: Druzhina (Unlocks in Feudalism, they have the same cost of a Pikeman)

• It's a Melee unit with 32 Combat Strength and 4 Movement Points. As Ability it has "+3 Combat Strength on territories in your sphere of influence".

Early Modern Era:

Muscovites (Expansionists)

LT: Third Rome

• +1  Food on Capital per State Religion Follower
• +1  Industry on Capital per State Religion Follower
• +2% FIMS on Capital per number of attached Territories on Capital 

EQ: Kreml'

• +2 Combat Strength in combat for Units in or adjacent to the District
• +10 Stability
• +10 District Fortification
• +5 Fortification on City or Outpost 
• Count as "Garrison"
• Is: Land Unit Spawn.
• Is fortified.

EU: Streltsy (Unlocks in Gunpowder Warfare)

• It's a Gunner unit with 44 Combat Strength, 4 Movement Points and a Range of 4. As Ability it has "Guardian".

Industrial Era:

Serbs (Militarist)

LT: (No Idea for a name)

• +1 Combat Strength for each war declared
• +5% FIMS on all Cities for each war declared

EQ: Serbian Orthodox monastery (temporary name, Always unlocked)

• +1 Influence per Farmers
• +1 Faith per Farmers
• +3 Food per adjacent Farmers Quarter
• -5% on Unit Industry cost (when at war)
• Count as "Farmers Quarter"
• Count as Religious District

EU: Serbian Conscript (temporary name, Unlocks in Nationhood)

• It's a Gunner unit with 46 Combat Strength, 5 Movement Points and a Range of 4 . As Ability it has "Home Guard" and "Stealth".

Contemporary Era:

Yugoslavs (Aesthete)

LT: People's Front 

• +6 Gold per Workers on City
• +6 Science per Workers on City

EQ: People's Assembly (temporary name, it's the same name of an infrastructure)

• +1 Influence per number of enacted Civics
• +1 Stability per number of enacted Civics
• +1 Workers Slot on City or Outpost
• Count as "Makers Quarter"
• Count as "Commons Quarter"

EU: Partizani (Unlocks in Insurrection Theory and is cheaper than Commandos)

It's a Gunner unit with 54 Combat Strength, 5 Movement Points and a Range of 4 . As Ability it has "+4 Combat Strength on territories in your sphere of influence" and "Stealth".

Natural Wonders: Man'pupunёr, Mount Elbrus, Valley of geysers

Cultural Wonders: Bol'šoj Theatre , Ermitage

AI Persona: Ivan III Vasil'evič (Cool Headed, Expansionist, Patron, Megalopolist)

Wonder Rework: Saint Basil's Cathedral

• +1 Faith per District
• +40 Stability 
• +20 Faith
• -50% on all Public Ceremonies Industry cost on Victorious City
• Is considered as a Holy Site but does not count toward the Holy Site cap.
• Must be built next to the Main Plaza.

For those who may have missed it, here's how the complete version will probably look like, I don't think that i will make further significant changes (reference)