Traditionally, you can take a look around (a chest and the flooded northern room) or move onwards, further to the east. I'd suggest saving your game, as inside one of the rooms you will have to fight not only weaker Necromancers (you should eliminate them first), but also an Arch Necromancer (screen above). He's not only very resistant, but can also summon strong creatures and use powerful offensive spells, so plan your attacks wisely and keep an eye on your health, magic and stamina bars.
After getting rid of all the enemies, search the area. I'd recommend breaking into the western room and take a look inside the eastern storage room. In the end choose the corridor leading south. Eventually you should reach a bigger room with an altar (screen above). You won't encounter any enemies there, but find more precious treasures hidden, inter alia, inside the big chest.
Choose the passage leading west and afterwards turn south. On your way you can break into the western room, though there's nothing particularly precious to be found inside. Use the stairs (screen above) and move the bolt to open the door. Note that you have therefore reached the balcony inside one of the previously visited rooms. Head to the door leading to Ilinalta's Deluge.
Go north. You should attack the Necromancers in the first room by surprise (screen above), though eliminating them shouldn't be too hard even normally. Use the chance to explore the eastern storage room and head west after checking each corner.
The north-west corridor should be patrolled by only a single Ascendant Necromancer (screen above) and I wouldn't recommend approaching him, as it might provoke the other necromancers to join in. Instead, you should wait for him to come to you himself and finish him off when he does.
As I mentioned before, there are other Necromancers in the area. They occupy the north-east room and you most of all need to look out for the Master Necromancer (screen above). Take into account that he not only will be very resistant, but also cast powerful offensive spells (he should especially like using ice projectiles) and summon mighty creatures to help.
After eliminating all the enemies, take a look around the area. I'd especially recommend taking a look inside the big chest to find a couple precious items. The most precious of them is of course the Broken Azura's Star, lying in front of the throne (screen above).
New main objective: Bring the Star to Aranea or bring the Star to Nelacar
Before deciding who to give the Azura's Star to, you will need to leave this place. Use the stairs leading onto the upper level of the tower and after getting there, search for a ladder leading to the surface (screen above). You will now have to choose your ally:
- If you want to bring the Daedric artifact to the elven mage Nelacar, skip to Option A - Bring the Star to Nelacar.
- If you want to give the Daedric artifact to Anarea, who's representing Azura's will, skip to Option B - Bring the Star to Anarea.
Option A - Bring the Star to Nelacar
Note! If you prefer to give the Daedric artifact to Anarea, skip to Option B - Bring the Star to Anarea.
Open the world map, return to Winterhold and once again head into the Frozen Hearth Inn. Approach Nelacar, speak to him and give him the broken Star (screen above).
New main objective: Tell Nelacar you're ready to enter the Star
Let the mage take a look at the artifact and soon afterwards it will turn out that the only way of making the Star work again is defeating Malyn Varen, who has placed his soul inside it. Nelacar will offer to temporarily move your soul to the Star, so that you can defeat Malyn on his own territory. Note! Before agreeing to move your soul to the Star (screen above), make some preparation as for obvious reasons your teammate won't be able to help you in the new area. I'd suggest permanently increasing your fire and electricity resistance, or at least bring potions and spells that can give you a similar effect. Additionally it would be good to have powers, shouts or spells that let you summon creatures to help. It's also worth to save your game, as you will be able to able to back out of the Star in case the battles in it prove too hard. Later on you can return to Nelacar and try again.
New main objective: Destroy Malyn Varen's soul
You will be transported inside the Azura's Star. Speak with Malyn Varen (screen above) and the mage will start running away. You will have to catch and defeat him.
DON'T try to catch up with him at once, as quickly eliminating him will be pretty much impossible. What's more, you could run into some big trouble as you will have to face one or a couple (up to three) Kynreeve Dremoras (screen above). They're quite a challenge, as not only do they have lots of hit points, but can also use powerful spells. The creatures should by default attack you with fireballs, but there's always a chance that they will use a different spell.
You need to fight the Dremoras very carefully, as otherwise you will get surrounded or get under massive fire and die quickly. You should make use of the mentioned summon, whichever type you have (screen above). It probably won't deal too much damage, but will draw their attention away enough for you to lead out attacks.
If you prefer close combat, it would be good to stick to one chosen Dremora and keep attacking it (screen above). The Unrelenting Force Shout might come in handy, as even though throwing them into the abyss is impossible, knocking them down to the ground will still make them easy targets.
If your character prefers ranged weapons, lead out precise attacks and keep constantly strafing to avoid getting hit. If you're more into magic, I'd suggest focusing on fire spells (screen above). Regardless of the chosen tactic, keep retreating to the starting point each time you kill a Dremora to get some rest and regenerate health, magic and stamina.
Head after Malyn Varen only after getting rid of all the Dremoras. Reaching the mage shouldn't take you much time (screen above).
You should begin the fight with the Unrelenting Force Shout (screen above) or any other attack that will knock him out or temporarily paralyse. Be ready to heal yourself often, as the mage will attack you with powerful lightning spells. Luckily however, he won't summon any creatures to help so you will be able to use your own for your advantage and numerical superiority.
Keep fighting until deprive Malyn Varen of his whole health bar. Nelacar (screen above) should now speak to you. Wait to get transported back to the world of the living.
Now you just need to have your final conversation with Nelacar. The mage will give you The Black Star (screen above), using which you will be able to use black souls to enchant items.