Function: The primary method for powering and protecting homes in the UK.
Mechanism: Four cornerstones are embedded in the foundation of a building. These stones draw ambient magic (The Hum) from the ground to create a protective ward and power magical appliances.
Wealthy: Can afford high-grade, self-recharging stones that provide robust protection and ample power.
Poor: Rely on cheap, synthetic, or magically-depleted “dross” stones that offer weak protection and frequently “brown out.” This socio-economic marker is known as the “Thaumic Poverty Line.”