Azura's Star (Oblivion)

Azura's Star is a powerful Daedric Artifact, similar to a Soul Gem, but unique in that it is reusable. It can be used to enchant or recharge powerful items. It appears in The Elder Scrolls III: Morrowind, The Elder Scrolls IV: Oblivion, and The Elder Scrolls V: Skyrim.

Morrowind
Azura's Star is the reward for the quest acquired at the Shrine of Azura.

Oblivion
Azura's Star is the reward for the quest received at the Shrine of Azura. It functions as a unique, reusable Soul Gem which is not consumed when used for enchanting or for recharging enchanted items. It can hold any creature's soul, up to and including those of Grand level. However, a Black Soul Gem is required to capture sentient souls.

Azura's Star is one of the main items, like the Skeleton Key, that completely eliminates an otherwise important problem facing the player throughout the game. In this case, once one acquires Azura's Star and possesses a moderate level of Mysticism and Conjuration control, the player will never need to pay for recharging items again. Also, if paired with the Umbra sword from the Clavicus Vile's Shrine quest, one can keep numerous enchanted weapons at any time. Azura's Star can also be used at an enchanting altar without it disappearing. If dropped and lost, the character who gave the player the quest will provide a new one after a chiding to look after it better and not lose it again.

Skyrim
Azura's Star is one possible reward for the quest titled The Black Star. Bringing the Broken Azura's Star to Aranea Ienith instead of Nelacar grants the Dragonborn with this Soul Gem-like Daedric Artifact. Similar to Soul Gems, Azura's Star has the ability to trap white souls, or those of non-sentient creatures. These souls can be used for enchanting and for recharging weapons. Unlike ordinary Soul Gems, Azura's Star is not destroyed after use: it is simply emptied, and must be filled with another soul to be used again.

Like some other Daedric Artifacts in Skyrim, town guards will comment on your possession of it.