Each clan begins with one suzerain and one vassal. These may grow into proper clans, and meanwhile you can engage in clan wars and receive a small income from your vassal.
You can declare an assault on any clan you wish – you just need to spend a certain amount of strategy points (more on that below). Then begins the 24-hour siege! You can attack your foe at this point, and for the next day you will be competing against that other clan. The higher the rating of the clan you’re besieging, the more expensive it is to commence the attack. Throughout the siege, you may be joined by other invaders – and in this case, the winner will be the clan with the highest number of strategy points during the 24-hour siege.
If the attack was carried out on a clan that had a suzerain, the winner is determined by comparing the siege points that each invader earned during the siege, and the current suzerain. If the clan was alone in the conflict, then only that clan’s points are considered.
After a successful siege, a captured clan becomes a vassal.
If at the moment of victory the invader already possesses the maximum number of vassals, that lord must decide within four hours which of their vassals will be released. Before the decision is made, this clan cannot enter a new siege.
Clans cannot possess more than eight vassals, so it is ideal to capture the strongest, if you can keep them in check. However, a vassal can always revolt if he or she doesn’t like a suzerain. Starting a rebellion also requires a certain amount of strategic points. Rebellions also last 24 hours, and at its end the points are summed up: if the vassal scored higher than the suzerain, the vassal becomes free.
You can withdraw from a siege at any time. To do this, select "Surrender" from the popup menu. The result will depend on exactly who chooses to surrender.
Only the leaders of clans and their advisers can initiate sieges or raise rebellions. A clan can also petition any suzerain, asking to be brought under the suzerain’s protection. Each day you can send a maximum of 10 such petitions. If the request is accepted, and the petitioner is not already in a clan, he or she immediately becomes the suzerain’s vassal. If the petitioner is already a member of another clan, a siege begins.