About 500 years into the Second Age, Sauron reappeared. He planned to take over Middle-earth and rule as a God-King. To seduce the Elves into his service, Sauron assumed a fair appearance as Annatar, Lord of Gifts, befriended the Elven-smiths of Eregion, led by Celebrimbor, and counselled them in arts and magic. With Sauron's assistance, the Elven-smiths forged the Rings of Power. He then secretly forged the One Ring, to rule all other rings, in the volcanic Mount Doom in Mordor. The Elves detected his influence when he put on the One Ring, and removed their Rings. Enraged, Sauron initiated a great war and conquered much of the land west of Anduin. Sauron overran Eregion, killed Celebrimbor, and seized the Seven and the Nine Rings of Power. The Three Rings were saved by the Elves, specifically Gil-galad, Círdan, and Galadriel. Sauron besieged Imladris, battled Khazad-dûm and Lothlórien, and pushed further into Gil-galad's realm. The Elves were saved when a powerful army from Númenor arrived to their aid, defeating Sauron's forces and driving the remnant back to Mordor. Sauron fortified Mordor and completed the Dark Tower of Barad-dûr. He distributed the remaining rings of the Seven and the Nine to lords of Dwarves and Men. Dwarves proved too resilient to bend to his will, but the Men were enslaved by Sauron as the Nazgûl, his most feared servants. Orcs and Trolls became his servants, with Easterlings and men of Harad.