Travelling Builder, Possibly Even More Achievements!!
A builder given to each Chief with a Clan castle. There's only one and he cannot be used at his own kingdom. Instead, he is sent to another kingdom to cut a clan member's building time in half. When the job is finished, even if the player gem rushes it, the travelling builder cannot be used again until half of the original time for the building project has passed. Even if the player assists at a later interval of time, he must wait half of the original time of the project for the traveling builder to return. The person who donated the builder receives 10% of the regular xp gain for the original job. This could even become another three tier achievement called "A Helping Hand" or something to that extent. Any criticisms are openly accepted, as I'm sure there might be more than a few.