Ward Net

A Ward Net is a carefully constructed series of Wards designed to achieve a warding effect over an area. They are notably used on the walls the Free Cities as ways to prevent flying demons (e.g. Wind Demons) from entering the area at night. Smaller examples include Farmers in Tibbet's Brook constructing nets on their fences to keep Demons off their land,, or the use of pre-constructed Messenger's Circle for individual/pairs of travelers.

The engineering of Ward Nets is presented as a complex engineering problem, with alignment, orientation, and spacing of wards all affecting the quality of the net. Demons are often described as looking for holes or weak points to break through.

Nets are also limited in their power - they would not be able to stop a certain strength or duration of bombardment. This is presumably because the magic used is drawn through wards, where only a certain amount is may be available, or where conversion / efficiency of the wards may vary. I may also be that whenever a demon attacks a ward it sustains small amounts of damage to the point where it can be rendered ineffective. This is why wards must be refreshed or repaired over time.