
Starting at level 4, players can request for one housing space's worth of Spells from their clanmates level 7 Clan Castles or higher allows them to hold two housing space worth of spells, and a level 10 Clan Castle allows them to hold three housing space worth of spells. Other Clan members will see the request in the Clan Chat and can donate a certain number of Troops, Spells or Siege Machines to the Clan Castle (depending on the Clan level and the player's Clan Castle level). Also, players can add a message to tell other players what troops they would like, and can even enforce specific requests to only allow other players to donate what's requested. Once players join a Clan, they have the ability to "Request" once every 20 minutes (or faster if the clan has a "Donation Request Wait Time" perk or if they bypass this wait time by using Gems). The Clan Castle can also be moved once it is rebuilt (you do not need to join a Clan first or remove any surrounding obstacles).
Once it is rebuilt, players are able to create a Clan or join an existing one. Rebuilding a Clan Castle requires 10,000 Gold but doesn't require a free Builder or any time. While it is in ruins, it is surrounded by Obstacles (plants and stones) and cannot be moved.
Players begin the game with a ruined Clan Castle. It houses Troops which can either be placed as reinforcements during an attack, or used as defenders when the player's base is under attack. A Clan Castle is needed for creating or joining a Clan. "The Clan Castle houses your Treasury and any reinforcement troops or spells sent by your clanmates."