The Black Star (Quest)

Background
''Aranea, a priestess of Azura, says I am destined to find an elven man, who can turn the brightest star as black as the night. She believes he is in Winterhold.'' Many years ago, Malyn Varen was exiled from The College of Winterhold for pursuing questionable research with Soul Gems. Malyn was trying to find a way to prolong his spirit, and he believed that storing his soul inside the Daedric Artifact, Azura's Star, would prevent him from dying. Unfortunately for him, one of the properties of the Star was that black souls&mdash;the souls of sapient, mortal beings&mdash;could not enter it. As such, he began experiments to modify the Star's properties so that it would accept black souls.

The further Malyn progressed toward this goal, the more Azura tormented him. The artifact slowly drove Malyn insane, causing him to hear voices and see people that were not there, and eventually murder one of his students. After this, he was exiled from the college, collected a band of followers, and continued his research at Ilinalta's Deep, an abandoned Imperial outpost that had mostly collapsed into the adjacent lake. There, he continued his work, eventually succeeding in capturing his own soul inside the modified Azura's Star and achieving a state of immortality.

Walkthrough
To receive this quest, the Dragonborn must first talk with Aranea Ienith at the Shrine of Azura, south of Winterhold. She will say that Azura has chosen the Dragonborn as her champion, and that they must find an elven mage who can turn the brightest star to the darkest night. This elf lives in Winterhold's The Frozen Hearth inn.

Talk to Dagur and ask him about the elf. He will say that the elf is called Nelacar, and that he has a rented room.

Talk to Nelacar and intimidate, persuade, or bribe the necessary information out of him. He will say that his mentor, Malyn Varen, was experimenting with Azura's Star, and that the last known location of Malyn was Ilinalta's Deep.

Ilinalta's Deep can be found west of Riverwood, near and to the north of The Lady Stone. There is a trap door atop a partially submerged tower that leads into the underground complex.

Ilinalta's Deep
After entering, go past the crucified skeleton and enter a flooded room with a partially open doorway on the left. Go through the doorway and down the subsequent hallway. Following the hallway is a small room containing a Skeleton and the first of many conjurers (Necromancers at higher levels) found throughout the dungeon. In the next room are two more conjurers, and a skeleton lurks in the room on the left, which contains some food and a potion of water breathing.

The door on the right leads to the next area, with a conjurer, a skeleton, and a wolf. The underwater passage behind the waterfall on the left leads to a hidden room with a chest and a Breathing Water skill book floating near the ceiling.

The right-hand passage in the next room leads to two conjurers and a skeleton. There is a small sleeping quarters to the left, as well as an Arcane Enchanter, an Alchemy Lab, and several useful pieces of loot. The door on the right has an apprentice lock, with a chest and some potions on the other side.

At the end of the next passage is a high-level conjurer, on the far side of a flooded depression that cuts across the room. There is a partially submerged stairway on the far side of the depression that can be used to approach the conjurer from the safety of the water. Under the water near the stairs is a door with an adept lock. Loot on the other side includes a chest containing a Spell Tome, potions, and gold.

Back in the partially flooded area, there is an altar with a leveled soul gem on the right and a pull chain on the left that raises the bridge across the water that was just crossed. A door on the left leads to a passage containing a cupboard and an apprentice-locked door on the right that opens onto a small room with a couple of potions and alchemical ingredients. Up the stairs on the far side of the room is a barred door. Activate the bar to move it and go through the door to come onto a small landing area overlooking the first room of the dungeon. Follow the landing to the right and through another door which leads to the final section of the dungeon, Ilinalta's Deluge.

Follow the path down to reach an area with two conjurers. There is a chest, and quite a few potions and soul gems scattered throughout this room and the smaller one to the right. The passage to the left leads down a path, through another door, and into a room occupied by a conjurer and a skeleton, with cages along both walls. Through the door at the end of the room is a set of stairs opening onto a medium-sized room with a high-level conjurer and four skeletons. There is no loot in here, so continue straight up the stairs to the left.

In the room at the top of the stairs, Malyn Varen's skeleton sits peacefully in a chair, with the Broken Azura's Star at its feet, his Grimoire on the floor next to his chair. Also in the room is a chest with a leveled amount of loot. With the Broken Azura's Star in hand, the dungeon can be exited via the ladder that leads to the ceiling.

Cleansing the Star
There are now two options to fix the Broken Azura's Star:
 * 1) Give it to Aranea Ienith
 * 2) Give it to Nelacar

Speaking to the desired person with the Broken Azura's Star in hand will begin this final step. Whichever option is chosen, the Dragonborn must enter the Star to cleanse it of Malyn Varen's soul. The Dragonborn is warped out of the Star several seconds after defeating Malyn inside, regardless of the status of Malyn's three Dremora henchmen.

Once Malyn's soul has been defeated, the Dragonborn is pulled out of the Star, thanked, and given either a working Azura's Star by Aranea Ienith, or the Black Star by Nelacar. The former can trap only white souls (those of non-sapient creatures) while the latter, according to Nelacar, can trap only black souls (the souls of sapient beings). In reality, however, The Black Star can hold either white or black souls, just like a black soul gem.

Additionally, bringing the Star to Aranea makes her available as a follower. While giving the Star to Nelacar does not provide a companion option, The Black Star has the advantage of a much more abundant source of grand souls, as all black souls are of the grand level. Meanwhile, only white souls from exceptionally powerful monsters such as the mammoth, are grand souls.

Trivia

 * Malyn's skeleton in Ilinalta's Deluge can be reanimated with an apprentice-level reanimation spell.
 * Defeating Malyn's Dremora is an effective way to collect Daedra Hearts. Loot the Dremora's bodies before being warped out of the Star.
 * Trying to pickpocket Malyn will prompt the message "This person has already caught you."
 * If Malyn is killed, a necromancer or two may attack his killer somewhere in Skyrim. See A Scrawled Note for more details.
 * The person that wasn't helped during this quest will have some foul words for the Dragonborn when they interact with them.
 * If Ilinalta's Deep and Deluge were cleared before starting this quest, new opponents will be present there when for the quest, even though Ilinalta's Deep will still be marked as "cleared" on the Skyrim map.
 * Aranea Lenith speaks of  a fort threatened by water, but not yet touched by it. She thinks this description applies to the College of Winterhold, but it also partly applies to Ilinalta's Deep, since it is also a fort threatened by water. However, Illinalta's Deep has obviously been damaged and, thus, touched by water indicating that Aranea spoke of the College of Winterhold.
 * Completing the quest with Nelacar can count as helping a citizen when becoming Thane.
 * If choosing the Black Star over Azura's Star and then returning to Aranea, she will respond by calling you a blasphemer and telling you to leave before she kills you for defiling Azura's artifact. She will not attack, though.
 * Both the Black Star and Azura's Star count as a Daedric Artifact, and both count toward the Oblivion Walker and Daedric Influence achievements/trophies.
 * When first entering The Frozen Hearth after starting the quest, Dagur can be overheard describing to Nelacar a smell that was like "a horrible monster was turned inside out and then exploded". This may be a reference to a scene in the movie Galaxy Quest in which Tech Sgt. Chen's first attempt at using a real "digital converyor" does exactly that to the monster threatening Captain Taggart on the planet's surface below.

Bugs
Der schwarze Stern (Quest) La estrella negra (misión) Чёрная звезда (квест)