Boundary Formation

Boundary Formation begins as a static, flag-based defensive dome in Blackflame, serving primarily as a training arena that contains physical threats while permitting madra techniques to pass. Over the series, the concept evolves from a simple scripted construct into a sophisticated, multi-layered system that integrates with increasingly complex sacred arts, eventually becoming a critical strategic tool in both combat and territorial control. Its fundamental principles of selective permeability and aura manipulation remain constant while its applications grow exponentially more sophisticated.