Direct answer
The ward emits a strong aura which prevents other vikings from building things. It also locks all doors within its influence.
Ward · Use

Result
Use the structure or item: Ward
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The ward emits a strong aura which prevents other vikings from building things. It also locks all doors within its influence.
Success signal:Check the described effect after using: Ward

The ward emits a strong aura which prevents other vikings from building things. It also locks all doors within its influence.

Use the structure or item: Ward
Explore the world