How about this..
Inside a clan we can make groups of 5 and we can war inside the clan.
Time limit should be 3 hours.(player must gem his things)like spell factory ,barracks
but each 5 players goes 1 vs 1.
One player have 3 saved war bases.so 1 player can attack 3 times and and number 1 base attack number 1.
We just need another war button thats all
