My suggestion is that clans can preform big raids, alone or partner up with another clan. This is similar to Boom beach where the damage done is permanent till the period of time is over. There are only one attack limited per member of the clan. Raids can be started by leader and co-leader. Loot is divided by the amount of damage done by the player (if I attack and did 200dmg to the raiding town hall you get a x amount of loot). The objective of the raid is to do much damage to the enemy as possible. To start a raid you must acquire map pieces. Map pieces can be found by members of the clan by doing normal attacks on other players. Map pieces will not always be found but there is a chance. Besides attacking, map pieces can be bought with gems by the leader or members of the clan. Map pieces can be form together to create a raid map ranging from 30 piece to 200 the more the map pieces the larger the map, the harder the raid, the more loots you get.