[Kjeld]

I have always wondered how exactly Fortune Tellers, Volva and other commanders that are supposed to prevent bad luck worked.
Do numbers matter ? (ie : if you have 5 volva, you are 5 times more likely to prevent a bad event than if you have ?) Does the location matter (do they prevent event "worldwide" or only in their current province, and in that case, do numbers matter ?) ?

Thanks !