Prerequistes: Thaumaturgy; Experience: 123456789xp
Activation: 2 hours Duration: 1 week
Ingredients: A chime tuned to sound at 439 Hz, a mcGuffin; see text.

The thaumaturges begin this ritual by drawing an elaborate warding circle at the boundary they wish to ward. They then place the chime, the lead thaumaturge and the mcGuffing in a triangulation in the centre of the circle, while the remaining thaumaturges take up their positions around the border of the circle.

The lead thaumaturge then chants his will into the chime, while he uses his a point of his blood to complete the circle and the mcGuffin to focus the chime to the nature of the boundary they wish to ward.

Upon successful completion of the ritual the chime will sound once. Thereafter it will continue working for one week, sounding once for every event that potentially threatens the boundary the chime was focused on.

System: Among events that can threaten the boundary are at least all thaumaturgic rituals, since they, by their nature, have to potential to fail in highly unpredictable ways. The chime will always sound at the same volume, regardless of the distance of the triggering event.

The chime will sound unfailingly on any event that might threaten the boundary. While this might sound like its very strong, it is actually its mayor weakness for the chime cannot tell the difference between the butt end of a cigarette on a rainy day and an arsonist during dry season. Therefore thaumaturges often exercise special care to select the mcGuffin, the location of the ritual and the particularities of the warding circle to let the chime ward only the area and the portion of the boundary they are actually interested in. This often requires trade-offs where eliminating a lot of the false positives might also exclude some actually interesting events from the warded area.

Making these deliberations in the first place typically require intimate knowledge of the area to be warded and the nature of the boundary that is warded. As some practical examples a particularly bad combination of location, warding circle and mcGuffin might result in a chime that will chime for any event that could threaten any boundary anywhere, while performing the ritual in central park, with a warding circle drawn with natural materials that represents the park accurately, with a mcGuffin that serves as an arcane link to both the hedge and central park will only make the chime chime for events in central park that threaten the boundary between this world and the hedge. On the other hand, it is nigh impossible to find a mcGuffin that serves as an arcane link to both the umbra and central park without significantly altering the nature of central park first.

Focusing the ill-tuned chime (maintenance) (Rank custom - 5)

Prerequistes: Focusing the ill-tuned chime (Rank custom); Experience: free
Activation: 30 minutes
Ingredients: The chime used in the prerequiste ritual, an effigy constructed our of ordinary materials; see text.

To begin this ritual the chime will sound once. Thereafter the thaumaturge will draw a greatly simplified warding circle, placing the chime, themself and the effigy in a triangulation in the centre of the circle.

They then chant their will into the chime, while he uses his a point of his blood to complete the circle and the effigy to focus the chime to the nature of the boundary they wish to ward.

System: This ritual will extend the duration of its prerequiste by one week and can only be performed in the final week of its duration. The effigy used in this ritual should represent the mcGuffing used in its prerequiste. While this ritual is much more lax than its prerequiste a particularly hasty or lousy thaumaturge might still find themselves accidentally widening the scope of its prerequiste.