Great Building Boosts

Population
Provides Population.
Great Buildings have this boost: Tower of Babel Capitol The Habitat Innovation Tower

Good production
Produces random goods from the players age every 24 hours. From Modern Era onwards produces twice as many unrefined goods instead.
Great Buildings have this boost: Tower of Babel Lighthouse of Alexandria St. Mark's Basilica Frauenkirche of Dresden Royal Albert Hall Rain Forest Project Atlantis Museum

Military boost
Attacking units have their attack and defense values boosted by a percentage.
Great Buildings have this boost: Statue of Zeus Cathedral of Aachen Castel del Monte

Happiness
Provides Happiness.
Great Buildings have this boost: Colosseum Hagia Sophia Notre Dame Frauenkirche of Dresden Alcatraz Space Needle Atomium Lotus Temple Gaea Statue Oracle of Delphi

Medal production
Produces Medals every 24 hours.
Great Buildings have this boost: Colosseum Deal Castle Gaea Statue The Blue Galaxy

Supply boost
The first number of collected Supplies productions are boosted by a percentage.
Great Buildings have this boost: Lighthouse of Alexandria Royal Albert Hall

Research
Produces Forge Points every 24 hours.
Great Buildings have this boost: Hagia Sophia Castel del Monte Cape Canaveral Innovation Tower Arctic Orangery The Kraken

Coin production
Produces Coins every 24 hours.
Great Buildings have this boost: Cathedral of Aachen Saint Basil's Cathedral Château Frontenac Space Needle The Habitat Lotus Temple The Virgo Project

Coin boost
The first number of collected Coins productions are boosted by a percentage.
Great Buildings have this boost: St. Mark's Basilica

Supply production
Produces Supplies every 24 hours.
Great Buildings have this boost: Notre Dame Capitol Dynamic Tower Voyager V1 Seed Vault Oracle of Delphi Himeji Castle

Fierce resistance
Defending units have their attack and defense values boosted by a percentage. Also, guild gains an amount to their support pool.
Great Buildings have this boost: Saint Basil's Cathedral Deal Castle

Quest Reward Boost
When you get coins, supplies, goods, diamonds or medals as rewards from quests, you receive an additional percentage on top.
Great Buildings have this boost: Château Frontenac

Penal Unit
Produces unattached units of a military building in the player's city every 24 hours. The time can be reduced by the Guild Recruitment Boost.
Great Buildings have this boost: Alcatraz

Support Pool Bonus
Guild gains an amount to their support pool.
Great Buildings have this boost: Observatory

Guild Goods
Produces some of each current good for the guild's treasury. Can only be collected when in a guild.
Great Buildings have this boost: Observatory Atomium The Arc

Aid Goods
The first number of times you aid a building you get a random good from that building's age.
Great Buildings have this boost: Dynamic Tower

Plunder Goods
The first number of times you plunder a building you get a random good from that building's age.
Great Buildings have this boost: Voyager V1

Contribution Boost
Contribution Rewards are increased by a percentage.
Great Buildings have this boost: The Arc

Aid Blueprints
Increased chance of finding a blueprint when aiding another player.
Great Buildings have this boost: Rain Forest Project

Helping Hands
Adds a chance of getting something extra by aiding other players.
Great Buildings have this boost: Seed Vault

Relic Hunt
A chance for spawning a hidden Relic reward on the Guild Expedition Map after solving an encounter.
Great Buildings have this boost: Temple of Relics

Critical Hit
Gives a chance to deal 150% damage against units of the same age.
Great Buildings have this boost: Arctic Orangery

Plunder and Pillage
Adds a chance of doubling plundered resources.
Great Buildings have this boost: Atlantis Museum

First Strike
For the first number of battles, there is a chance to kill one enemy unit at the start of battle. For two-wave battles, the skill applies only to the first wave.
Great Buildings have this boost: The Kraken

Double Collection
For the first number of buildings collected, there is a chance the resources collected are doubled. Excludes military and great buildings.
Great Buildings have this boost: The Blue Galaxy

Advanced Tactics
Attacking and defending units have their attack and defense values boosted by a percentage.
Great Buildings have this boost: Terracotta Army

Spoils of War
The first number of victorious battles have a chance of providing you with a random reward.
Great Buildings have this boost: Himeji Castle

Previous Era Goods Production
Produces random goods from the player's previous age every 24 hours. For the Bronze Age it produces Bronze Age goods.
Great Buildings have this boost: Star Gazer

Missile Launch
For the first number of battles, there is a chance of killing half the enemy units at the start of the battle. For two-wave battles, the skill applies only to the first wave.
Great Buildings have this boost: The Virgo Project