Go speak to Onmund and he tells you about a trade he did with Enthir. He wants you to go to him and ask him about the amulet. Locate and speak to Enthir. He is HARD to persuade and you can’t buy the amulet from him either. Ask him if there’s any way to get the amulet back.
Return to Enthir once you have the staff and he’ll give you the amulet that Onmund want’s so bad. Now simply go and give it back to Onmund, who will be overjoyed and will join you as a companion anytime you ask now.
Skyrim is the homeland of the Nords, a fierce and proud warrior people who are well suited for the bitter cold and mountainous terrain which defines the land. Now scarred by civil war, Skyrim faces its darkest days with the return of the legendary dragons and their leader, the World-Eater Alduin. The future of Skyrim and even the lands beyond hangs in the balance, as the people await the prophesized Dragonborn, a hero born with the power of The Voice and the only one who can contend with the dragons. You are that Dragonborn; your task is to investigate why the dragons are returning, and discover a way to defeat them. At the same time, you’re free to explore Skyrim at your own pace, uncovering its many wonders along the way.