Fog may be summoned from forest, swamp and ocean provinces. Once a location has produced a fog, another fog may not be summoned from that place until the first has dissipated. The fog will have a strength of twice the amount of piety invested in its summoning.
Storms lose one point of strength at the end of each month.
When a fog's strength reaches zero, it dissipates. While the fog exists, the summoner will get a location report for the province that it is in. Character sightings will not appear in foggy province's location report. Characters in sublocations of the province will still be seen, however. Also, all sublocations of a foggy province are treated as if they are hidden.