I have a saved concept of the Incas, but I never revealed it because the one I made with Aztecs was so nice, making one of the same quality with Incas would take me a long time. And well, since the Sultan Ascend DLC came out, the idea of variants and aqueducts changed all the bases of my concept.
Of course, I can still share ideas for their possible appearance in the game. When I make it official I will add images:
INCAS
Urbanism / Technologies / Agriculture
1.- Conquerors of knowledge
Develop up to 20 unique technologies from the many towns incorporated into the empire. Landmarks offer many of these technologies earlier and at a cheaper price.
2.- Mesoamerican Civilization
Unique Units of the Noble House replace the function of the advanced siege. Shock Infantry replace the function of the Cavalry. New tech tree for the smithy, dock, and mill.
3.- Agricultural Civilization
Colca replaces Mill, a building whose harvested food generates 10% more resources.
Fields replace houses, with a higher population (20), and generate flames over time. These can be harvested for food or put in corrals to generate gold.
4.Rituals
Ushnu is a unique building that increase villagers construction by 20% in near buildings (8 tiles) and that generates rituals by sacrificing food for passive bonuses. These bonuses increase in cost and effect depending on age. You unlock new rituals depending on age.
5.- Tahuantinsuyu Army
You can choose from a large number of unique units for certain unit roles. Some have better stats than others, or unique abilities that work better for various situations.
6.- Andean Sling
City Centers, Fortresses and Tambos throw rocks instead of arrows, with siege damage. Tambo replaces the Outpost, can be upgraded to Fortified Tambo which has the ability to be a resource gathering area, as well as Galagas, which throws rocks in an area attack.
Andean Slinger as a unique ranged unit, with greater range and damage than a common slinger. Siege Slinger as a special anti-building unit.
7.- Tambos and Capac Ñam
Tambos generate a speed bonus to nearby units, as well as an extra bonus. This extra bonus improves if a network of Inca Roads is connected between different tambos.
8.- Monolithic Mastery
Villagers gathering Stone 15% better.
9.- Temples of the Sun and the Moon*
When you advance to the 3rd age you can choose between the Great Temple of the Sun and the Great Temple of the Moon.
The ones of the Moon allow you to create acllas in acllahuasis, which reduce the costs of rituals, buildings or military units. You can build a maximum of 3 acllahuasi and 15 acllas.
The ones of the Sun allow you to create priests of the sun, as well as various technologies that improve the obtaining of gold from relics and sacred sites.
You can build 2 landmarks per age, so you can have both, if you get the enough resources for that.
10.- Totora
Fishing boats, merchant urcas and transport ships are 25% cheaper.
Fishing boats can build the floating island Urca, which acts as a floating dock, allowing you to collect fish in the open sea, as well as supply 10 extra population.
11.- Vilcabamba revolution
You can build 2 landmarks per age. Build the two landmarks of Imperial age to unlock Vilcabamba revolution, to unlock Manco Knights, Captured Falconets, and Vilcabamba gunners.
About Agriculture.- Although the Incas were a civilization that devoted much of itself to agriculture, the agricultural lands of Peru were terrible: The coast was a desert, and the Andes are too irregular for agriculture. For this reason, they had to develop techniques to “modify” the entire terrain and adapt it for agriculture, especially with the terrace system. They also developed other techniques such as ridges, or water cultivation. For this reason, they “cannot” have a basic agricultural bonus like the English, but rather “technologies” that improve the basic harvesting of the same.