Expansions

Expansions are buildings that need to be placed in the physical space of the game world to be build, rather than City Improvements, which are simply housed in the City Center.

Different types of expansions provide different benefits to the city their built in, such as improved FIDSI output, Strategic and Luxury resources, or Vision over an area, and each type of expansion has certain rules on where they can be placed.

Districts

Districts are the most common type of Expansion, making up the physical form of a City. All cities start with only a single district - the City Center - and grow out from there by placing districts adjacent to the City Center or other districts. Districts can only be placed on tiles within the same region as the City Center, and cannot be placed on Ruins, Minor Faction villages, Ridges, or - except for the Cargo Docks - Sea/Lake tiles. Once a district is built, the tiles surrounding it that are not occupied by other districts and in the same region as the City Center will be added to the city's area of exploitation. Additionally, a district built over a watchtower foundation, strategic resource deposit, or luxury resource deposit will automatically act as a watchtower or resource extractor, respectively, so long as the appropriate technology is unlocked.

All districts can be leveled up by surrounding them by 4 other districts of the same level or higher, and provide additional FIDSI (and sometimes Approval) output at higher levels. While most factions can only upgrade districts to level 2, the Cultists can upgrade districts to level 3 due to their "High Seat of the Queen" trait.

The most common type of district is the Borough Streets, which become available for construction by increasing a city's population; every 2 population for most factions, every 1 population for the Necrophages due to their "Cellulose Mutation" trait. The Allayi instead use the Garth of the Allayi, which is available every 1 population. Both have Industry costs that increase for every additional Borough/Garth built.

Borough Streets Faction: All except Allayi Obtained: Available From Start Type: Expansion Focus: District	Costs: 150		In order for a city to grow in a controlled manner, new fields must be added in a way that permits regulated and sanitary growth. By building streets, gutters, and sewage systems, cities can expand without the attendant problems of disease and congestion.
Effects: -10 on city tile -1 on city tile +1 on city tile +1 on city tile +1 on city tile +2 per extra level on city tile +2 per extra level on city tile +2 per extra level on city tile +20 fortification per extra level on city +15 per extra level on city tile Can be used as a resource extractor Available every 2 from city population

Garth of the Allayi Faction: Allayi Obtained: Faction Trait Type: Expansion Focus: District	Costs: 150 10		This garth, or sacred garden, is a center of work, study, and devotion, as well as a focal point for the power of the Pearls and the magics of Auriga
Effects: -5 on city tile +2 on city tile +2 on city tile +2 on city tile +2 on city tile +2 on city tile +4 per extra level on city tile +4 per extra level on city tile +4 per extra level on city tile +20 fortification per extra level on city +15 per extra level on city tile Can be used as resource extractor Available every from city population

Unique Districts

Aside from the Borough Streets and Garth of the Allayi districts, there are a number of districts that can only be built once per city, or once per Empire in the case of the Altar of Auriga. They usually have specific requirements to be built, such as being placed on a specific kind of tile, and most are unlocked from Blessings.

Abbey of Anomalies Faction: All Obtained: 3rd Winter Type: Expansion Focus: District	Costs: 400 10		It is a place rich in the powers of Dust and Auriga's Pearls, and sanctified by prayer. Diligent study and work at the Abbey enhance the ability to draw riches from Anomalies in the city.
Effects: x2 on City Tile x2 on City Tile x2 on City Tile x2 on City Tile x2 on City Tile x2 on City Tile +5 per level on City Tile +3 on terrain with Anomaly Limited to one copy in your City To be built on Anomaly

Altar of Auriga Faction: All Obtained: Available From Start Type: Expansion Focus: District	Costs: 150 10		The Altar of Auriga is a sacred building to those who live upon her. It is a center of ancient power from the times even before the Endless. By bringing her Pearls here and unlocking the Altar's Blessings, powerful magical effects can be applied to a city, region, or empire.
Effects: +5 per level on Altar of Auriga +3 per level on Altar of Auriga +2 per level on Altar of Auriga Limited to one copy in your empire Unlocks functionalities of the Altar of Auriga screen

Cargo Docks Faction: All Obtained: Era III Type: Expansion Focus: District	Costs: 600		A centrally-organized port helps safeguard empire supply lines, and allows longer-term planning. Sea shanties still permitted.
Effects: Limited to one copy in your city Can only be built on coastal waters or ocean with exploitation Creates ocean roads (used by trade routes) +5 on city tile +1 on city tile +1 on city tile +5 on terrain with sea or lake +10 on city +2 per extra level on city tile +2 per extra level on city tile +10 per extra level on city tile Decreases the embark/disembark cost.

Luxury Intensifier Faction: All Obtained: 3rd Winter Type: Expansion Focus: District	Costs: 400 10		Luxuries of Auriga, those elements of both magic and wondrous beauty, can be made to yield more of their power when their exploitations are augmented by Auriga's Pearls.
Effects: x2 Resource on Resource Extractor +10 per level on City Tile +10 on terrain with Luxury Resource Limited to one copy in your City To be built on Luxury Resource Deposit

Strategic Intensifier Faction: All Obtained: 3rd Winter Type: Expansion Focus: District	Costs: 400 10		Tapping the great veins of power and magic in the Dust-filled crust of Auriga, these buildings improved by Pearls increase the quantities of riches that can be harvested from the planet.
Effects: x2 Resource on Resource Extractor +10 per level on City Tile +10 on terrain with Strategic Resource Limited to one copy in your City To be built on Strategic Resource Deposit

Winter Borough Faction: All Obtained: 3rd Winter Type: Expansion Focus: District	Costs: 600 20		Those who save in summer, profit in winter. Wise words, and in this case put to the test by preparing buildings, supplies, streets, and citizens for the worst of times.
Effects: +2 per level on City Tiles during Winter +2 per level on City Tiles during Winter +1 per level on City Tiles during Winter Limited to one copy in your City To be built during Winter

Legendary Buildings

Finally, there are the Legendary Buildings. Constructing one of these districts is considered a Legendary Deed, and as such, each one can only be built once in the world. There is one legendary building for Eras I through V, and as with other Legendary Deeds, are available for any empire to build as soon as the building's era has been reached by any empire in the world.

Museum of Auriga Faction: All Obtained: Available From Start Type: Expansion Focus: Legendary Building	Costs: 500 5 5		This vast building hosts displays and explanations of Auriga's natural wonders. From resources and anomalies to peoples and fauna, the marvels of Auriga can be studied here.
Effects: +20 per level on Museum of Auriga +20% on Empire Approval (Happy) +20% on Empire Approval (Happy) +20% Cost reduction on Empire Approval (Happy) Can only be built once in the world

Industrial Megapole Faction: All Obtained: Era II Type: Expansion Focus: Legendary Building	Costs: 1000 15 15		Towns blossom with buildings and fortifications as the city plans you laid long ago come to fruition. In fact, your cities have been designed as enormous, efficient centers of industrial activity.
Effects: +25 per level on Industrial Megapole -20% District cost on empire Can only be built once in the world

Alchemic Institute Faction: All Obtained: Era III Type: Expansion Focus: Legendary Building	Costs: 1500 25 25		Built of the most modern materials to the most rigorous standards, this unequaled center of study and science permits researchers to delve into the nature of Auriga's magical resources.
Effects: +20% Research Cost reduction in past Eras +25 per level on Alchemic Institute Can only be built once in the world

Throne of Emperors Faction: All Obtained: Era IV Type: Expansion Focus: Legendary Building	Costs: 3000 35 35		In this lofty building the greatest lords, merchants, and ambassadors meet to discuss the gravest matters. There are many chairs, but only one throne - and all Aurigans bow when you sit upon it.
Effects: Reduces the cost of diplomatic treaties by 30% (no with ELCP) With ELCP: -30% Influence cost of Empire Plan on empire. +50 per level on Throne of Emperors Can only be built once in the world

Reliquary of Auriga Faction: All Obtained: Era V Type: Expansion Focus: Legendary Building	Costs: 5000 45 45		Larger than a palace, this grand edifice displays the innumerable treasures and artifacts that tell the story of your military victories. To visit it is to absorb awe, pride, and undying courage.
Effects: +100 per level on Reliquary of Auriga -50% on military upkeep Can only be built once in the world

Resource Extractors

Resource extractors are buildings that need to be built over resource deposits in the same region as the City Center. Upon completing a resource extractor, it will produce 1 unit of the associated resource per turn. Placing a resource extractor on a tile will not prevent a district from being placed there.

For each resource extractor, the appropriate technology must be unlocked before it can be built.

Strategic Resource Extractors

Titanium Extractor Faction: All except Mykara Obtained: Era I Type: Expansion Focus: Exploitation	Costs: 60		At the heart of the titanium extraction method is a vast furnace used to spelt the metal out of its mineralized form.
Effects: +1 on city

Glassteel Extractor Faction: All except Mykara Obtained: Era I Type: Expansion Focus: Exploitation	Costs: 60		After chemical preparation, using huge machines, molten glassteel is forced into delicate strands ready for industrial use.
Effects: +1 on city

Adamantian Extractor Faction: All except Mykara Obtained: Era III Type: Expansion Focus: Exploitation	Costs: 300		Incredible temperatures are reached inside these towers, allowing adamantian to be freed from its captive ore.
Effects: +1 on city

Palladian Extractor Faction: All except Mykara Obtained: Era III Type: Expansion Focus: Exploitation	Costs: 300		A miasma of thick, alkaline vapors drifts though these works, and stinging sweat pours from the workers. Such is the price of palladian extraction.
Effects: +1 on city

Mithrite Extractor Faction: All except Mykara Obtained: Era IV Type: Expansion Focus: Exploitation	Costs: 600 10		Built above seams of mithrite, a precious green mineral, this structure houses a collection of lines, machines, and furnaces used to produce its valuable refined form.
Effects: +1 on City

Hyperium Extractor Faction: All except Mykara Obtained: Era IV Type: Expansion Focus: Exploitation	Costs: 600 10		The ear-splitting screech of steam and iron ring loud in the smoggy confines of the plant, but the noise is worth it to liberate the valuable Hyperium.
Effects: +1 on City

Luxury Resource Extractors

Dye Extractor Faction: All except Mykara Obtained: Era I Type: Expansion Focus: Exploitation	Costs: 60		A region building allowing the extraction of the Dye Luxury.
Effects: +1 on city

Emerald Extractor Faction: All except Mykara Obtained: Era I Type: Expansion Focus: Exploitation	Costs: 60		A region building allowing the extraction of the Emerald Luxury.
Effects: +1 on city

Gold Extractor Faction: All except Mykara Obtained: Era I Type: Expansion Focus: Exploitation	Costs: 60		A region building allowing the extraction of the Gold Luxury.
Effects: +1 on city

Spice Extractor Faction: All except Mykara Obtained: Era I Type: Expansion Focus: Exploitation	Costs: 60		A region building allowing the extraction of the Spice Luxury.
Effects: +1 on city

Wine Extractor Faction: All except Mykara Obtained: Era I Type: Expansion Focus: Exploitation	Costs: 60		A region building allowing the extraction of the Wine Luxury.
Effects: +1 on city

Blood Crystal Extractor Faction: All except Mykara Obtained: Era III Type: Expansion Focus: Exploitation	Costs: 300		A region building allowing the extraction of the Blood Crystal Luxury.
Effects: +1 on City

Grassilk Extractor Faction: All except Mykara Obtained: Era III Type: Expansion Focus: Exploitation	Costs: 300		A region building allowing the extraction of the Grassilk Luxury.
Effects: +1 on City

Moonleaf Extractor Faction: All except Mykara Obtained: Era III Type: Expansion Focus: Exploitation	Costs: 300		A region building allowing the extraction of the Moonleaf Luxury.
Effects: +1 on City

Quicksilver Extractor Faction: All except Mykara Obtained: Era III Type: Expansion Focus: Exploitation	Costs: 300		A region building allowing the extraction of the Quicksilver Luxury.
Effects: +1 on City

Titan Bones Extractor Faction: All except Mykara Obtained: Era III Type: Expansion Focus: Exploitation	Costs: 300		A region building allowing the extraction of the Titan Bones Luxury.
Effects: +1 on City

Dust Orchid Extractor Faction: All except Mykara Obtained: Era IV Type: Expansion Focus: Exploitation	Costs: 600 10		A region building allowing the extraction of the Dust Orchid Luxury.
Effects: +1 on City

Dustwater Extractor Faction: All except Mykara Obtained: Era IV Type: Expansion Focus: Exploitation	Costs: 600 10		A region building allowing the extraction of the Dustwater Luxury.
Effects: +1 on City

Hydromiel Extractor Faction: All except Mykara Obtained: Era IV Type: Expansion Focus: Exploitation	Costs: 600 10		A region building allowing the extraction of the Hydromiel Luxury.
Effects: +1 on City

Pixie Blood Extractor Faction: All except Mykara Obtained: Era IV Type: Expansion Focus: Exploitation	Costs: 600 10		A region building allowing the extraction of the Pixie Blood Luxury.
Effects: +1 on City

Redsang Extractor Faction: All except Mykara Obtained: Era IV Type: Expansion Focus: Exploitation	Costs: 600 10		A region building allowing the extraction of the Redsang Luxury.
Effects: +1 on City

Towers

Towers are built on foundations, which are revealed upon reaching Era II. Both types of towers provide an area of Vision starting from the tower, but Watchtowers and Defensive Towers provide other distinct benefits. Additionally, Watchtowers are unlocked through technology, while Defensive Towers are unlocked through blessings.

Placing a tower on a tile will not prevent a district from being placed there.

Watchtowers

Aside from the vision provided by Watchtowers, they also provide bonus health regeneration to friendly units on the tower and its adjacent tiles, as well as Detection within their vision range. There are three versions of the watchtower - each better than the last - which are unlocked by three different technologies; upon unlocking the technology for the next tier watchtower, any previously-constructed watchtowers will be automatically upgraded.

Watchtower Faction: All except Morgawr and Mykara Obtained: Era II Type: City Improvement Focus: Vision	Costs: 250		The long-range views from the top of the Watchtower let you to see what is happening near your frontiers.
Effects: +15% Health regen on Watchtower +3 Vision on Watchtower +3 Detection range on Watchtower +20 Fortification on Watchtower Watchtowers' health regen effects are applied to their adjacent tiles.

Lookout Towers Faction: All except Mykara Obtained: Era III Type: City Improvement Focus: Vision	Costs: 350		A network of towers that are crewed day and night give both a defensive bonus to the city and an increase in vision range.
Effects: +5 Vision on Watchtower +20% Health Regen on Watchtower +20% Ally Health Regen on Watchtower +5 Detection Range on Watchtower +30 Fortification on Watchtower Watchtowers' Health Regen effects are applied to their adjacent tiles

Remotuscope Factory Faction: All except Mykara Obtained: Era V Type: Expansion Focus: Vision	Costs: 450		The development of the theory of optics and increase in the precision of glasswork has led to this dazzling invention that allows a man to see a thousand paces. Hostile armies will not stay hidden so easily.
Effects: +25% health regen on Watchtower +25% allly health regen on Watchtower +7 vision on watchtower +7 Detection range on watchtower +50 fortification on watchtower Watchtowers' health regen effects are applied to their adjacent tiles

Defensive Towers

Defensive Towers do not provide as large a vision range as normal watchtowers, and do not provide health regeneration or detection. However, they do inflict Retaliation Damage to hostile units in their vision range. There are two tiers of defensive towers, and - as with watchtowers - any previously-built defensive towers of the first tier will automatically be upgraded to the second tier once the appropriate blessing has been unlocked.

Tower of Truth Faction: All except Mykara Obtained: 1st Winter Type: Expansion Focus: Vision	Costs: 150 10 (5 with ELCP)		This tower acts as a defensive shield for your city, striking those who would come and do ill to your empire.
Effects: +2 Vision on Defensive Tower +10 Fortification on Defensive Tower +0.3 Retaliation Damage per Fortification on Defensive Tower Damage is spread across all units of unfriendly army at the start of the turn To be built on Watchtower Foundations revealed at Era II

Tower of Fidelity Faction: All except Mykara Obtained: 3rd Winter Type: Expansion Focus: Vision	Costs: 200 20 (10 with ELCP)		Only the faithful and the true-hearted escape the wrath of this tower; those who come to destroy will be struck by its anger.
Effects: +3 Vision on Defensive Tower +20 Fortification on Defensive Tower +0.5 Retaliation Damage per Fortification on Defensive Tower Damage is spread across all units of unfriendly army at the start of the turn To be built on Watchtower Foundations revealed at Era II