Azura's Star or The Black Star

This reusable soul gem is rewarded for completing The Black Star quest.

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 previously-enchanted weapons.

The Black Star has the ability to trap black souls, or those of sentient beings, though it functions like a Black Soul Gem which traps all souls up to the Grand level, in it. This renders it as the wiser choice of the two.

Dawnbreaker

This One-Handed sword is rewarded for completing The Break of Dawn quest.

Dawnbreaker sets enemies on fire, while also dealing more damage to undead like draugr and vampires and has a chance to make undead explode into blue flames upon death, which damages and causes nearby undead to flee, in the same sense as Bane of the Undead.

Ebony Blade

This Two-Handed sword is rewarded for completing The Whispering Door quest.

The Ebony Blade absorbs 10 points of health from enemies, but can be upgraded only by slaying friendly NPCs (such as a person whose favor has been completed).

For every two such characters killed the weapon increases in power, adding 2 to the strength of the absorb health, up to the maximum of 30. Due to coding errors, it levels up Two-Handed, buts benefits from One-Handed perks. This has be fixed via patch 1.9.

Ebony Mail

This piece of unique armor is rewarded for completing Boethiah's Calling quest.

The Ebony Mail is a heavy armor cuirass that is enchanted with the muffle effect and inflicts 5 poison damage per second to nearby enemies.

Mace of Molag Bal

This One-Handed weapon is rewarded for completing the House of Horrors quest.

The weapon not only drains 25 points of stamina and magicka per hit, it also steals the soul of an enemy if they die within 3 seconds.

Masque of Clavicus Vile

This unique Heavy Armor helm is rewarded for completing A Daedra's Best Friend quest, but only if you choose to give Vile his axe instead of using it to kill Barbas.

Masque of Clavicus Vile holds the following enchantments:

• Prices are 20% better
• Speech increased by 10 points
• Magicka regenerates 5% faster

Mehrunes' Razor

This unique dagger is rewarded for completing the Pieces of the Past quest.

Mehrunes' Razor's enchantment has a 1.25% chance to instantly kill any opponent.

Oghma Infinium

The Oghma Infinium is a powerful tome of knowledge that is rewarded for completing the Discerning the Transmundane.

When read, the Oghma Infinum will grant a permanent boost to all skills related to the three major guardian constellations, the Warrior, the Mage, and the Thief.

Ring of Namira

This ring is rewarded for completing The Taste of Death quest.

The Ring of Namira grants the user with a 50 point Stamina boost and the bonus of feeding on corpses granting 50% health and stamina regeneration.

Sanguine Rose

This unique staff is rewarded for completing A Night to Remember quest.

The Sanguine Rose summons a leveled Dremora to fight for the wielder for 60 seconds.

Savior's Hide or/and Ring of Hircine

Either of these items is a potential reward for completing Ill Met By Moonlight quest, in a certain manner.

Savior's Hide is a unique light armor cuirass that may be obtained if Sinding is killed at the conclusion of the quest. It provides the following benefits

• Increases Magic Resistance by 15%.
• Increases Poison Resistance by 50%.

The Ring of Hircine may be obtained if Sinding is helped during the quest. Its enchantment grants the wearer infinite werewolf transformation a day, assuming that the wearer is already a werewolf.

Skeleton Key

The Skeleton Key is obtained during the Thieves Guild quest Blindsighted, but must be returned to the Twilight Sepulcher to complete the questline.

The key is essentially a decorative unbreakable lockpick. It may be kept permenantly, but at the cost of not being able to progress any further in the Thieves Guild questline.

Skull of Corruption

This unique staff is rewarded for completing Waking Nightmare quest.

The Skull of Corruption deals 20 points damage, but increases to 50 if powered with dreams collected from sleeping people. Casting the staff at them while sleeping will gather 5 dreams for the staff. Casting at an NPC while they're awake however will be treated as an attack.

The staff has a range of effect on it and also has a unique screen illusion when casting.

Spellbreaker

This unique shield is rewarded for completing The Only Cure quest.

When blocking, it produces a Ward-like effect that protects the user from 50 points of magic damage.

Volendrung

This unique warhammer is rewarded for completing The Cursed Tribe quest in Largashbur.

Volendrung, also known as the Hammer of Might, absorbs 50 points of Stamina per hit. It is essentially a giant stamina battery, as many two-handed weapons use a lot of stamina for their power attacks.

Wabbajack

This unique staff is rewarded for completing The Mind of Madness.

The Wabbajack casts an unpredictable spell whose effect ranges from transforming enemies into other creatures to casting a random Destruction spell to even fully healing enemies.