Common buildings:
Picture
Name
Cost
Requires
Function
Village Hall
nothing
nothing
*The Village Hall is automatically built in every town and produces 500 gold per day.
Town Hall
2500 gold
*Village Hall
*Tavern
*The Town Hall replaces the Village Hall and produces 1000 gold per day.
City Hall
5000 gold
*Town Hall
*Blacksmith
*Mage Guild
*Marketplace
*This improvement upon the Town Hall produces 2000 gold per day.
Capitol
10000 gold
*City Hall
*Castle
*This final upgrade of the previous three buildings produces 4000 gold per day but can only be built in one of your towns.
*When you capture a town with a Capitol while you already have one, the new one is automatically downgraded to a City Hall.
Fort
5000 gold +20 wood +20 ore
*Village Hall
*When a Fort is built, the town is surrounded by walls.
Citadel
2500 gold +5 ore
*Fort
*This improvement upon the Fort adds a moat and an arrow tower to the town's defense.
*Creature growth increases by 50%.
Castle
5000 gold +10 wood +10 ore
*Citadel
*This final upgrade of the previous two buildings adds 2 smaller arrow towers to the town walls.
*The total basic creature growth is increased by 100%.
Mage Guild level 1
2000 gold +5 wood +5 ore
*Village Hall
*The Mage Guild allows heroes to learn 5 level 1 spells.
*Spellbooks can be purchased here for 500 gold.
*The Mage Guild also restores the full amount of spellpoints of any hero that ends his/her turn in that town.
Mage Guild level 2
1000 gold +5 wood +5 ore +4 crystal +4 gems +4 mercury +4 sulfur
*Mage Guild level 1
*This upgrade adds another level to the Mage Guild where heroes can learn 4 level 2 spells.
Mage Guild level 3
1000 gold +5 wood +5 ore +6 crystal +6 gems +6 mercury +6 sulfur
*Mage Guild level 2
*This upgrade adds another level to the Mage Guild where heroes can learn 3 level 3 spells.
Mage Guild level 4
1000 gold +5 wood +5 ore +8 crystal +8 gems +8 mercury +8 sulfur
*Mage Guild level 3
*This upgrade adds another level to the Mage Guild where heroes can learn 2 level 4 spells.
Mage Guild level 5
1000 gold +5 wood +5 ore +10 crystal +10 gems +10 mercury +10 sulfur
*Mage Guild level 4
*This upgrade adds another level to the Mage Guild where heroes can learn 1 level 5 spells.
Marketplace
500 gold +5 wood
*Village Hall
*The Marketplace allows you to trade one type of resources for another type. (the rate gets more profitable if you control more Marketplaces)
*You can donate resources to other players here too.
Shipyard
2000 gold +20 wood
*Village Hall
*Enables ships to be build. (1000 gold and 10 wood per ship)
Tavern
500 gold +5 wood
*Village Hall
*In the tavern you can recruit new heroes for 2500 gold each. (the available heroes change every week)
*Your heroes that have fled or surrendered from combat end up in the tavern as well.
*In the tavern you can also listen to rumors.
*You can visit the Thieves' Guild to check on the status of your opponents. (the more taverns you own, the more detailed the information in the Thieves' Guild'll be)
*The tavern also increases the Morale of garissoned troops by 2.

Conflux buildings:
Picture
Name
Cost
Requires
Function
Artifact Merchants
10000 gold
*Marketplace
*A set of artifacts is for sale here (you can use either gold or other resources to trade), and artifacts may be traded for resources too. (the rate gets more profitable if you control more Marketplaces)
Blacksmith
1000 gold +5 wood
*Village Hall
*The ballista can be purchased here.
Garden of Life
1000 gold
*Magic Lantern
*6 more Pixies/Sprites are available each week.
Resource Silo
5000 gold +5 ore
*Marketplace
*Produces 1 mercury each day.
Magic University
5000 gold +10 wood +10 ore
*Mage Guild
*Visiting heroes can learn the secondary skills Air/Earth/Fire and Water Magic for 2000 gold pieces each.


Conflux creature buildings:
Picture
Name
Cost
Requires
Function
Magic Lantern
300 gold +5 wood +5 ore
*Fort
*Pixies are trained here.
Upgraded Magic Lantern
1000 gold
*Magic Lantern
*Sprites are trained here.
Altar of Air
1500 gold +5 ore
*Magic Lantern
*Mage Guild
*Air Elementals are trained here.
Upgraded Altar of Air
1500 gold +2 wood +2 gems +2 mercury
*Altar of Air
*Storm Elementals are trained here.
Altar of Water
1500 gold +5 ore
*Magic Lantern
*Mage Guild
*Water Elementals are trained here.
Upgraded Altar of Water
2000 gold +5 ore +5 mercury
*Altar of Water
*Ice Elementals are trained here.
Altar of Fire
2000 gold +5 wood +5 ore
*Altar of Air
*Fire Elementals are trained here.
Upgraded Altar of Fire
2000 gold +5 ore +5 mercury
*Altar of Fire
*Energy Elementals are trained here.
Altar of Earth
2000 gold +10 ore
*Altar of Water
*Earth Elementals are trained here.
Upgraded Altar of Earth
1000 gold +5 sulfur
*Altar of Earth
*Magma Elementals are trained here.
Altar of Thought
3000 gold +5 wood +5 ore +2 crystal +2 gems +2 mercury +2 sulfur
*Altar of Earth
*Altar of Fire
*Psychic Elementals are trained here.
Upgraded Altar of Thought
3000 gold +3 crystal +3 gems +3 mercury +3 sulfur
*Altar of Thought
*Magic Elementals are trained here.
Pyre
10000 gold +10 wood +10 ore +10 mercury
*Altar of Thought
*Firebirds are trained here.
Upgraded Pyre
15000 gold +10 wood +10 ore +20 mercury
*Pyre
*Phoenixes are trained here.


The Grail:
Picture
Name
Cost
Requires
Function
Aurora Borealis
nothing
*Village Hall
*+5000 gold/day
*+50% creature growth
*Places all spells in your Mage Guild