Code Stone

A huge stone to announce new laws. All the laws as tax, commercial, and welfare can be set.
Overview
Code Stone is a structure that unlocks the ability to enact policies. Once built, it serves as the required building for the policy system, allowing the kingdom to make use of policy effects and related management options.
Because its function is tied directly to policies, Code Stone is a progression structure rather than a general-purpose building. If policies are part of your current strategy, constructing it should be a priority so that you can access that layer of kingdom administration as soon as possible.
Official description
A huge stone to announce new laws. All the laws as tax, commercial, and welfare can be set.