Construction
To begin construction a coven must have at least 5 active players.
Construction requires different resources depending on the type of the building: items, energy, dices, and Unity Stones.
Total item requirements are calculated based on the amount of players in the coven. Every additional member in the coven increases the construction requirements by a certain amount.
Every member can donate any amount of resources. Only the total amount matters.
You can also use gems instead of items for donations to Coven Buildings. The total amount of required resources is divided by the amount of coven members (can't be less than 10 in this formula). From that we get a certain amount of resources calculated for one person. You can donate that amount for 25 gems.
Example: A clan has 20 members. Six types of resources are required for buiding or reactivation. One player can donate 1/20 of every required resource for 25 gems.
If one or more resources are fully donated their share is distributed equally among other resources.
If the Tower has not been built yet, coven members can only donate resources to the Tower construction. When the Tower is built, coven members can donate to the construction of other buildings.
When donation is complete, coven leader must give the order to start building. Regular members or officers can't give this order. Building process takes 24 hours. After that the building automatically activates and starts giving bonuses to all coven members.
How can I collect the bonuses?
Go to the main coven page. If the bonus is ready, the corresponding building is highlighted. Click on those buildings and then click "Collect Bonus" in the building window.
Re-activation
Coven buildings stay active for 30 days since last activation. After that they become inactive and stop giving bonuses. They can be re-activated.
The Tower must be active in order to re-activate other buildings. Re-activation also requires resources: items, potions, energy, Unity Stones, etc.
Re-activation process is similar to the building process: coven members donate a certain amount of resources and then the coven leader gives the re-activation order. Unlike initial construction, re-activation is instant. The building is ready to give bonuses right after re-activation.