Each tribe possessing one or several Nodos is allowed to make a contract with them. They can draw a specific number of clauses (called 'Labors'), the amount of which was determined beforehand by the Golden Tribe. Since all of the Nodos, except Age, is allied with the Silver Tribe, currently only that of the Iron Tribe and the Silver Tribe's labors are known.
- The 12 Labors: The 12 Labors of Iron Tribe...
- Silver Tribe Labors: The Labors of Silver Tribe...