Sauron is approaching the point where he must forge the One Ring in The Lord of the Rings: The Rings of Power season 3 and two Lord of the Rings characters will help you do this. Sauron is finished The Rings of Power Season 2 with most of the Rings of Power completed. The three elven rings were finished, but out of reach, the seven dwarven rings were made and distributed, and the nine men's rings were made and ready to be distributed. After distributing them, Sauron has only one Ring of Power to forge - the One Ring.
The Rings of Power Season 3 should begin with Sauron distributing the Rings of Men and should cover Sauron forging the One Ring. Only after that can the show's story evolve into the tales of "Akallabêth" and "Of the Rings of Power and the Third Age" it is destined to cover. Those Silmarillion chapters delve into Sauron's misadventures with the One Ring in tow. Before that, Sauron will be looking at two of the Lord of the Rings' more powerful characters for guidance in forging the One Ring.
Sauron will use techniques from Celebrimbor and Morgoth to forge the One Ring
Sauron will seek out Morgoth and Celebrimbor for the design of the One Ring
Sauron will look to Celebrimbor and Morgoth for inspiration and guidance to forge the One Ring in The Rings of Power season 3. This will be based on The Silmarillion and Morgoth's Ringtwo posthumously published compilations of Tolkien stories. Sauron learned a lot from Celebrimbor in The Rings of Power 2nd season, especially the importance of sacrifice, as he stated. Sauron literally poured his blood, sweat and tears into the Nine. While the many tears Sauron cried in Season 2 may not have fallen into the rings, the Nine were imbued with Sauron's blood and physical touch.
The Dark Lord Sauron proved to Celebrimbor that he was prepared to make his own blood sacrifice to strengthen the rings. Sauron also made contact with Celebrimbor at a high level early in the development of the Rings of Power, giving Celebrimbor the necessary knowledge. Celebrimbor and Sauron exchanged techniques while doing Three and Seven, while Celebrimbor did most of the manual labor on Nine. Either way, Sauron will take much of Celebrimbor's technical knowledge to Mount Doom when he forges the One. However, it is Morgoth's design that Sauron will use to begin the One Ring.
The dark magic Sauron needs for the only ring has been used once before
Arda was Morgoth's ring in The Lord of the Rings
When forging the One Ring, Sauron will be copying a ritual attempted by just one other being in the history of Middle Earth. Only Vala Morgoth was deranged enough to attempt a complete fusion of his own being with another physical substance. Although Sauron left Eregion with Celebrimbor's technological advances and idea of sacrifice, it is Morgoth's evil genius that he will attempt to replicate with the One Ring. If Celebrimbor truly taught Sauron's sacrifice, it seems that good and evil in the show can use the same fundamental principles to create objects of immense power.
...Morgoth poured his being into the fabric of Arda, ensuring its lasting influence even after his defeat. The result was Arda Marred...
Long before the events of The Rings of PowerMorgoth warred with the Valar in the Battle of the Powers. This cosmic struggle entailed the Valar building Middle-earth and its wider world from the ground up, while Morgoth corrupted, distorted, and destroyed what they built. At this time, Morgoth poured his being into the fabric of Arda, ensuring its lasting influence even after his defeat. The result was Arda Marred – the world ruined forever until it was broken and remade in the final battle, the Dagor Dagorath. While Sauron would attempt this process with metalArda was the Ring of Morgoth.
Without Celebrimbor, Morgoth's incarnation project will be the downfall of Sauron
Celebrimbor could have helped Sauron create a better ring
Celebrimbor and Morgoth were trying to teach Sauron a lesson about sacrifice in creation, but it wasn't worth it. Perhaps an inspiration for Voldemort's Horcruxes in Harry Potter, The splitting of Morgoth and Sauron's souls tied them to their physical forms. "Ósanwe-kenta" in Morgoth's Ring explains how bad deeds were binding when it came to Ainur's shapeshifting and regeneration. The promotion of personal purpose gradually eroded this capacity. However, as Morgoth's Ringeven Morgoth's defeat failed to remove his soul from Arda, leaving much of it with a "Melkor Ingredient"with an innate corruptibility:
Morgoth's power was disseminated throughout Gold... It was this Morgoth element in matter, in fact, that was a prerequisite for the magic and other evils that Sauron performed with and upon him.
The gold of the One Ring contained the ingredient Melkor. In a way, it contained Melkor himself. Sauron followed Morgoth's plan of incarnation and poured so much of his being into the One that he was immensely strengthened by it, but so trapped in the draining process that he could never again assume a physical form after its destruction. Through your black magic, Sauron became trapped in his physical form, as did Morgoth. But Sauron's plan had a fatal vulnerability that Morgoth's did not. Morgoth was linked to the entire world and no one would destroy him; at least, until the prophesied end.
The One Ring could and would be destroyed, leaving Sauron's final body destroyed along with him and his soul with no means of returning to the Seen world. Celebrimbor did most of the forging of the Nine and could have helped Sauron create a better One Ring. But Sauron killed him in a rage and returned to Morgoth on an atomic level, joining him inside the ring. Whatever relationship the two had The Lord of the Rings: The Rings of Powerperhaps it was justice that they ended up together in the final moments of Sauron's speech in Middle-earth.