How can I get the plans for the main building?

1. Create constrictions on warhammers or engage in constrictions on allies on them.
2. Complete tasks on the radar (marked with an orange icon).
3. Destroy the Dark Legion.
4. Collect resources on farms (only they can give plans for the main building).
5. Attack elite guards and exchange purple badges for main building plans.
6. You can get it in the ruins of the item.