Quests are objectives for players to perform a certain tasks which are then rewarded. There are wide variety of different tasks like producing certain resources, achieving certain conditions, advancing on the campaign map, constructing buildings, etc.
Quests can be separated into 5 different categories, all of them are provided by non-player quest givers.
Main article: Story Quests
Story quests provide an overarching plot for an entire era. Those quests contain a lot of tasks that require advancing on the campaign map. Story quests can not be aborted.
Main article: Side Quests
Side quests are unlocked in Bronze Age. New side quests are triggered by completing story quests, researching technologies, constructing specific buildings, scouting and conquering provinces. If the player completes or aborts all available side quests, recurring quests will take place until the requirements for new side quests are fulfilled.
Main article: Recurring Quests
Recurring quests require the player to collect some resources, gain units, or do other tasks to gain rewards. Completing them gives one random reward. Diamonds can be earned through recurring quests, but only once for each quest.
To unlock recurring quests, the player must complete or skip all available side quests that are in queue. At any point of the game there are certain set of recurring quests. Those can be aborted and therefore cycled through if the player chooses. They keep going in a loop until an in-game action unlocks more side quests.
Event quests are temporary tasks available with each event. Players can complete those until the event ends. After that those quests become unavailable and new ones will be provided with the next event.
Completing event quests is a necessary mean to get the most out of the event since they provide useful event resources and milestone rewards to receive special prices provided in the event.
Main article: Daily Challenges
Daily Challenges provide players with a new quest every day. Each day players can choose between two different reward chests and get certain amount of tasks which will reward the chosen chest upon completing. After completing seven Daily Challenges players are rewarded with additional Challenger's Chest.