Attunement Sphere

The Attunement Sphere is a miscellaneous item given to the Dragonborn by Septimus Signus during the quest Discerning the Transmundane. It is used in certain Dwemer ruins to unlock the way to Blackreach, by placing them into Dwarven Mechanisms.

Attunement Spheres are used in Alftand, Mzinchaleft and Raldbthar.

Even after it’s initial purpose for the College of Winterhold questline is fulfilled, the Attunement Sphere remains a quest item and cannot be removed from the inventory unless it is lost in a jailbreak.