Vassal Clans
Vassals are clans who agree to exchange 50% of their income and unlimited military access in return for the protection the military might of their overlord affords. The net result of this is that vassals may find themselves dragged into conflicts not of their own design, and unlike regular allies, cannot decline a request to fight for their overlord without automatically declaring war on them. Clans do not usually offer themselves as vassals, the situation is generally forced upon them as part of a diplomatic deal that is more of a thinly-veiled threat than a fair and balanced offer.