The Incas were best known for establishing the largest empire in pre-Columbian America. The administrative, political, and military center of the empire was located in Cuzco in modern-day Peru whose framework constituted of officials or Kamayuks who kept important records by utilizing a quipu messenger system rather than a formal writing system. These officials also controlled the Incan army which were a collection of the numerous ethnicities they conquered. Much of their army constituted of peasants and farmers which can be conscripted into battle at any time, and to mirror this, their Villagers benefit from Blacksmith upgrades.
The Incas referred to their empire as the Tawantinsuyu which can be translated as "The Four Regions" or "The Four United Provinces". To reflect this achievement, the Incas can train more than one unique unit, namely, the Kamayuk, an anti-cavalry infantry which can attack over other units thanks to their long spears, and the Slinger, anti-infantry stone thrower. Their Castle Age unique technology eliminates their Skirmishers and Slingers' minimum range, referring to the Incas' effective use of slings in combat.
The Incas were also known for their architecture. They did not use mortar, yet their buildings are resilient to earthquakes. To reflect this and their strength in stone working, their buildings consume fewer stone and their Houses support more population. The Incas are also known for their sophisticated farming system which makes extensive use of terracing techniques, and as the result, their team bonus makes Farms build faster.
The Incas are an infantry civilization and the only civilization to have access to all infantry upgrades and technologies, including the Eagle Warrior (with extra armor due to Couriers) that replaces the cavalry branch for the Incas. They also have all upgrades and technologies for their archers (excluding the mounted and gunpowder variants the Incas naturally do not get), and also get a unique unit at the Archery Range: the Slinger. In the siege department they are also very solid, only missing out on Siege Onagers and, logically, Bombard Cannons. The same goes for their navy, where next to the gunpowder ships, only the Heavy Demolition Ship is amiss. Their Monks are average and their defenses very good. They miss Architecture, but their stone discount they get on all buildings makes up for that. Their economy is also pretty good, only Two-Man Saw is missing.
All in all, the Incas have very few gaps in their technology tree (next to the two big gaps namely cavalry and gunpowder), which makes them very versatile. Also, they have a wide array of counterunits at their disposal which makes them tricky to handle at times.
When playing a random map game against the computer, the player may encounter any of the following Incan AI characters:
Huascar: Sapa Inca of the Inca Empire from 1527 to 1532 AD, succeeding his father Huayna Capac and brother Ninan Cuyochi.
Huayna Capac: The third Sapa Inca of the Inca Empire, sixth of the Hanan dynasty, and eleventh of the Inca civilization. His original name was Tito Husi Hualpa.
Manco Capac: According to some historians, he was the first governor and founder of the Inca civilization in Cusco, possibly in the early 13th century. He is also a main figure of Inca mythology, being the protagonist of the two best known legends about the origin of the Inca, both of them connecting him to the foundation of Cusco.
Manco Inca Yupanqui: A founder and monarch (Sapa Inca) of the independent Neo-Inca State in Vilcabamba, although he was originally a puppet Inca Emperor installed by the Spaniards. He was one of the sons of Huayna Cápac and a younger brother of Huascar.
Pachacuti: The ninth Sapa Inca (1438–1471/1472) of the Kingdom of Cusco which he transformed into the Inca Empire (Tawantinsuyu). Most archaeologists now believe that the famous Inca site of Machu Picchu was built as an estate for Pachacuti.
Topa Huallpa: Original name Auqui Huallpa Túpac, was the first vassal Inca Emperor installed by the Spanish conquistadors, during the Spanish conquest of the Inca Empire led by Francisco Pizarro.
Tupac Inca Yupanqui: The second Sapa Inca (1471–93) of the Inca Empire, fifth of the Hanan dynasty, and tenth of the Inca civilization. His father was Pachacuti, and his son was Huayna Capac.
Viracocha: The great creator deity in the pre-Inca and Inca mythology in the Andes region of South America.