Warding Circle vs Cathayans
This ritual is an adaptation of Warding Circle vs Ghouls, which applies to Cathayans - the "Kindred" of Asia. The material component is one point of Cathayan vitae (about 1/2 pint) per 10 feet of radius.
In the early-to-mid 21st century, this ritual is known almost exclusively to veterans of the San Francisco chantry. The Tremere are trying to limit its use to vital areas, to keep the Kuei-jin from developing a counter-measure.