Azura's Star in Oblivion is a Daedric artifact that functions as a reusable Grand Soul Gem. Unlike regular soul gems that break after a single use, Azura's Star can be recharged infinitely, allowing you to trap souls repeatedly without the need to find new soul gems

. Key features of Azura's Star:

• It acts as a grand soul gem that can hold any size of soul, but it cannot trap NPC souls (black soul gems are required for that)

• When used to recharge enchanted weapons or armor, Azura's Star becomes empty but remains in your inventory, ready to be recharged again

• It is especially valuable for keeping enchanted weapons charged, which become essential against powerful enemies later in the game

• You can recharge Azura's Star by killing enemies with a weapon enchanted with Soul Trap or by casting a Soul Trap spell before killing an enemy

• The artifact is obtained by completing Azura's Daedric quest, which involves offering Glow Dust at Azura's Shrine and then defeating five vampires in the Gutted Mine

Important gameplay advice:

• Do not give Azura's Star to Martin during the "Blood of the Daedra" quest, as it is one of the most powerful and useful items in the game and you will lose it permanently if you do

• Using Azura's Star with weapons like Umbra (which has Soul Trap enchantment) allows you to farm souls efficiently and keep your enchanted weapons fully charged

In summary, Azura's Star provides an infinite soul gem resource for soul trapping and recharging enchanted items, making it a highly valuable item throughout Oblivion