Azura's Star was broken during Malyn Varen's experiments to find a way to prolong his life; he believed that storing his soul inside the Daedric artifact would prevent him from dying. Unfortunately for him, one of the properties of the Star is that black souls—the souls of sentient, mortal beings—cannot enter it. As such, he began a quest to manipulate the Star's properties, which resulted in the Black Star, which is so named because of the black crystal in the center and being darker than the normal Azura's Star in the presence of the invading impure soul within. He was ultimately successful, leaving a Broken Azura's Star behind within Ilinalta's Deep.
After acquiring the Broken Azura's Star, the Dragonborn can bring it to either Aranea Ienith or Nelacar, both of whom will task the Dragonborn with evicting Malyn Varen's soul from the artifact. With this completed, do one of the following to obtain the desired form of the Azura's Star:
- For Azura's Star, a refillable Grand Soul Gem, take the Star to Aranea Ienith, forcing the Dragonborn to enter the star by Azura and enter into combat with Malyn after a short dialogue. He will be accompanied by three Dremora during the fight. Kill Malyn (and his Dremora) and Azura will pull the player character from the Star, and grant them the cleansed Star as the reward.
- For The Black Star, a refillable Black Soul gem, take the Star to Nelacar, were he will place the player character into the Star and Malyn will have to be defeated. Upon Malyn's defeat, Nelacar will pull the player character out of the Star and gift the newly made Black Star as a reward.
- The Broken Star has purple blotches among the green. This likely represents Malyn's soul within.