The term 'Blueprint of a large spiritual fortress' refers to a detailed plan or design for a monumental structure intended to embody and reinforce spiritual significance or strength. Such a fortress could be a type of religious or cultural landmark, often found in regions with strong spiritual or historical ties. The design might include elements that reflect local traditions, architectural styles, and spiritual symbolism. Detailed blueprints would typically include plans for the structure's layout, construction materials, and decorative features, aiming to create an environment conducive to spiritual reflection and communal gathering.