The Clan Capital allows you to research Clan technologies using Scientific Tractates. Unlike Clan bonuses, the effects of Clan technologies apply to all players' cities, regardless of whether they are located within the Clan's territory.

 

Clan territory	Research various Clan buildings and improvements to bonuses. Increase the maximum number of Forts that can defend the Capital. Increase the maximum number of Clan members.
Allies	Research various army and City improvements. Increase the maximum number of help requests for each ally.
Fortifications	Improve fortifications in your Forts and Capital.