Nepheli Loux is a warrior and fellow tarnished in Elden Ring, whose sole purpose is to follow her father’s advice. Once she meets the tarnished, Nepheli starts finding her own purpose in the form of a unique questline.
In this guide, we will help you locate Nepheli Loux and how you can progress her convoluted quest to see its conclusion. Before we proceed, make sure to follow every step precisely as even a single mistake will lock you out of Nepheli’s quest.
First Encounter – Stormveil Castle

The first time you will meet Nepheli Loux is in Stormveil Castle. You can find her in a secluded room near the Golden Tree sapling. This area is littered with Stormhawks and other enemies. Make sure to kill them before you enter the room.
Nepheli will be standing near the dead body of a demi-human. Talk to her to officially start her questline. She will tell you that Gideon sent her here to kill Godrick, the Grafted.
After that, her summon sign will appear before the gate of the first shardbearer Godrick. Make sure that you summon her for the fight. Kill Godrick by keeping her alive at all costs. Once done, return to the Roundtable Hold for your second encounter.
Second Encounter – Roundtable Hold

Talk to Sir Gideon Ofnir near the Roundtable Hold and exhaust all of his dialogues (if you haven’t before). Reload the area by resting at the table and he will move back to his quarters. Go to his room and talk to him once more. Go outside his room and talk to Nepheli Loux.

She will tell you about her parentage. Exhaust her dialogue to obtain Arsenal Charm talisman from her. This will conclude your second encounter with Nepheli Loux.
Third Encounter – Village of the Albinaurics

Go to the Village of the Albinaurics in the southwestern Liurnia. This area is marked by poisonous swamps and giant crabs.

You can find Nepheli sitting beneath the bridge in front of a mound of corpses. Talk to her and she will move away.

Fast travel to the Roundtable Hold for your fourth encounter with her.
Fourth Encounter – Roundtable Hold, Again

This time you can find Nepheli Loux sitting on the floor in the lower section of the Roundtable Hold. To reach this area, go down the stairs present near Master Hewg. You can either talk to Nepheli Loux here (recommended) or can give her Seluvis Potion (not recommended).
Visit Chapel of Anticipation
The next step is a bit difficult one. You need to find Stormhawk King ashes for Nepheli Loux. These are available in the very starting area of the game called the Chapel of Anticipation.

Go to the Four Belfries and use the Imbued Key to travel to the chapel. Kill the Grafted Scion in this area and find the Stormhawk King ashes from a treasure chest inside a previously locked room.

Once you have the ashes, return to the Roundtable Hold and hand over the ashes to Nepheli. She will thank you and you will learn some additional information about her. Reload the area to find 2x Stormhawk Axes from the location Nepheli was sitting.
Final Encounter – Stormveil Castle’s Throne Room

Before you proceed to the throne room in Stormveil Castle, find and start Kenneth Haight Questline. Progress his quest up to the point where he leaves for Castle Haight and try to find a successful ruler.

Return to the Stormveil castle where you killed Godrick, the Grafted. Go through the door to reach the Throne Room. There you will find Nepheli Loux standing in front of the throne alongside Kenneth.

Talk to her and she will give you Ancient Dragon Smithing Stone. She will also tell you that she has renounced her father and will help you once you become the Elden Lord. This will officially conclude Nepheli Loux questline in Elden Ring. You can buy another from Gostoc here for 20,000 Runes.
Nepheli Loux Quest Glitch Fix
The game may glitch, and you won’t find the NPC in the throne room. If this happens, simply reload the area by just resting at the site of grace here. This glitch has been patched in the 1.03.2 patch for Elden Ring.