Born from the collective wisdom of the first Reality Anchors who faced the initial void incursions, the Doctrine Sentinel emerged when ancient preservation techniques were inscribed into living geometric matrices. These animated codices became self-aware guardians, dedicated to ensuring that fundamental anchoring principles would never be lost to entropy or misapplication.

Manifests as a hovering geometric tome with pages of crystallized light that constantly rewrite themselves with golden equations and stability theorems. The binding features interlocking reality anchors that pulse with protective energy, while complete geometric borders resist any attempt at dissolution. Its presence strengthens nearby anchoring attempts by providing real-time guidance and error correction through projected geometric overlays.

Serves as both repository and active enforcer of Anchor Warden doctrine, monitoring technique application and intervening when fundamental principles are violated. It ensures that reality anchoring efforts maintain maximum effectiveness by providing guidance and preventing the degradation of proven methodologies.