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Europa Universalis IV: Third Rome Includes:

• Tsardoms and Principalities: New ranks of Russian government with new abilities and, for Tsars, strong bonuses including the right to claim entire States – not just provinces.
  
• Iconography: Commission great religious icons for the Orthodox church, boosting your empire’s power depending on the saint you choose to revere.
  
• Metropolitans: Consecrate highly developed provinces with Metropolitans, adding to the authority of the Orthodox Church, but for a cost.
  
• Streltsy: Special Russian soldiers that excel in combat, but raise the cost of stabilizing your empire
  
• Siberian Frontier: Russia can slowly colonize uninhabited border regions, with no fear of native uprisings

This immersion pack is bundled with goodies beyond the gameplay improvements:

• Russian Principality Units: New army models for Ryazan, Yaroslavl, Odoyev and Tver.
  
• Russian Border Units: New army models for Perm, Kazan, Pskov and Lithuania
  
• What If Unit Pack: Army models for potential nations Polotsk, Smolensk, Ruthenia and Nizhny Novgorod