When worn, each Ring of Power gives its bearer the prevention and slowing of decay of time, by granting its wearer an unnaturally long life and rendering things invisible or visible, though it can confer power only according to the measure of each possessor. The Dark Lord had originally intended these rings to subject the Elves to his will and to use their power to gain dominion over the earth. After the rings were forged, Sauron secretly forged the One Ring, a master ring to control the wearers of all the other Rings, at Mount Doom. The Elves hid their rings upon discovering Sauron's motive, and Sauron in turn demanded all the Rings for himself, waging war against the Elves to recover them. He successfully seized sixteen of them, Seven of which were subsequently sent to the Dwarf-lords and Nine to several leaders of Men, hoping to bring them under his sway. The Three, which Celebrimbor had already sent to the Elf leaders in Middle-earth, remained hidden from Sauron. Though the Seven only fueled the greed of the Dwarves, the Nine corrupted the Men, turning them into the Nazgûl, Sauron's chief servants.