I've thought about it too. There would have to be something, like a territory block (7 DtD), a dungeon heart (DK1-2, WotO), or this stature of Valheim, that makes it clear who or which group owns the territory that this item marks. Within the area, this item could then save every few minutes like a blueprint every block that is placed or mined by the owner or the group (environment), depending on the setting. Then there would have to be repair tools of varying effectiveness (7DtD = stone axe, carpenter's hammer, nail gun), with which you can see these transparent, permeable blueprint blocks and restore them with one blow (in a radius of 1m also several blocks) if you are entered in the area block (but in survival you have to have corresponding material in your inventory. This would allow area owners to restore their buildings just as quickly as attackers can destroy them.Or even faster, because attackers have to overcome the hardness of the blocks. In the game Red Factions Armageddon, you can also use nanotechnology to restore broken paths.