

The Doctrine of the Dyad was etched on the walls of the Sith Citadel on the planet Exegol, where it served as a reminder of its importance to the Sith Order. Although the Rule of Two ensured the survival of the Sith for a millennium, Darth Sidious stated that it was a "pale imitation" of the Doctrine of the Dyad. It was the predecessor of the Rule of Two, a decree developed by Darth Bane to limit the Order's ranks to two Sith Lords-a Sith Master and a Sith apprentice-at any given time.

The Doctrine of the Dyad was a concept centered on the unbreakable Force-bond between two Force-sensitive beings collectively known as a Force dyad. The Doctrine of the Dyad preceded the Sith Order's Rule of Two. Legends claim that two beings sharing this profound connection gain access to a great number of abilities-skills beyond the grasp of even the most powerful Force wielder." ―Darth Sidious But this decree is said to merely be a pale imitation of its predecessor, the Doctrine of the Dyad. " For a millennium, the Sith have adhered to the Rule of Two.
