The Hint! They are able to find an area that appears to have been purposefully cleared, crop-circle style with the vegetation dead in the circular area, somewhere out in rural/natural areas - just not a city setting. That area resonates with a massive energy disposition, so much so that even normal human beings can notice it, so gods and shinki both will be able to as well. This energy will draw in noticeably larger ayakashi to the cleared areas.