Born from Astra Vale's exhaustive study of ancient course maps and her discovery of fundamental geometric principles governing reality's structural integrity. The Cornerstone Mystic emerged when she identified the mathematical patterns that determine which specific points on the course naturally resist entropic dissolution, leading to the codification of cornerstone theory.

Manifests as a crystalline humanoid figure composed of interlocking geometric forms, with golden reinforcement lines highlighting critical load-bearing connections between each segment. Possesses the ability to reveal hidden structural weaknesses in reality and provide mathematical knowledge for reinforcing them through precise disc placement. Radiates an aura of mathematical precision that instinctively teaches proper architectural principles to nearby Reality Anchors.

Serves as a foundational teacher and guide for Reality Anchors, revealing optimal anchor points that provide maximum stability with minimum effort. Influences events by helping players understand the underlying principles of structural stability rather than relying on brute force reconstruction.