Once on the Cerilian side of a portal, they try to gather as much strength as possible, leaving the life around them weaker. Generally, the plant life near a recently closed portal (at which will o’shadows were present) looks wilted and brown for 1d4 days per round that the portal was open.
Will o’shadows have lesser Seeming. In combat, they may camouflage themselves with blur, color spray, dancing lights,or a hypnotic pattern.