I had this idea a few weeks ago. Usually alliances between clans are created, but these alliances have a limit because when it comes to attack can not be done with exclavos because they attack everything that is not their clan. It could create a system of partnerships perhaps limited so that it is not abuse. My idea would be something like that.
-Only alliances between two clans
-The allied clans can not access the bases of the opponent or destroy them.
-The exclaves of attacked never the players and slaves of allied clan.
-To create an alliance you must have the confirmation of both clans and to leave it also.
-the allies will not be able to build near the base of the others either.
It would be a very good idea that would add emotion to the game