  We discuss stabilizer quantum-error correction codes implemented in a single
multi-level qudit to avoid resource escalation typical of multi-qubit codes.
These codes can be customized to the specific physical errors on the qudit,
effectively suppressing them. We demonstrate a Fault-Tolerant implementation on
molecular spin qudits, showcasing nearly exponential error suppression with
only linear qudit size growth. Notably, this outperforms qubit codes using
thousands of units. We also outline the required properties for a generic
physical system to Fault-Tolerantly implement these embedded codes.
