Schematic drawing of the base of a spiritual bastion

Quick answer：

A 'spiritual bastion' is typically a metaphorical term referring to a place or concept that serves as a source of inspiration, strength, or protection. The 'schematic drawing of the base' would be a technical plan or blueprint of the foundation of such a structure. This could include details such as dimensions, structural elements, and reinforcement specifications. In architecture or civil engineering, such drawings are essential for construction projects to ensure stability and safety.