Clan Challenges are the limited time activities. They are updated every 24 hours.
There are a few kinds of these activities:
- Gain a certain number of Encounter victories
- Gain a certain number of Ship victories
- Earn a certain amount of silver
- Earn a certain amount of gold
- Gain a certain number of Battle points in any battles
Reward is the clan currency depends on the degree of the completed task and distributed equally among all members of the clan. There is also an additional reward which depends on the player's personal contribution to the victory over the boss.