Skyrim:Atmah

Atmah is the ghost of a Redguard sorceress who only exists during impressions of past conversations with the Arch-Mage during the quest The Staff of Magnus.

Atmah was the Arch-Mage's favorite student during her time at the College of Winterhold. She led a group of mages, including Savos Aren, Hafnar Ice-Fist, Takes-In-Light, Elvali Veren and Girduin to an off-limits ruin called Labyrinthian. After encountering various monsters like a skeletal dragon and draugr, only Atmah, Hafnar, and Savos Aren were left alive. The trio then proceeded into the final chamber to confront Morokei, a dragon priest, where Savos magically enthralled Atmah and Hafnar to keep the dragon priest contained. 

Atmah and her dead companions' ghosts haunt Labyrinthian, forever re-enacting the scenes of their exploration for whomever follows in their footsteps. 

The apparition of Savos can be seen at the end of the dungeon, mourning for his lost friends and cursing himself for leaving Atmah and Hafnar behind.
 
Related Quests
 
Quest-Related Events
The Staff of Magnus
Atmah first appears with her companions at the entrance to Labyrinthian, but does not speak. In the next chamber, you will see the mages again, preparing themselves:

:Elvali: ''"I can't believe we're doing this." 
:Savos: "Can you imagine the looks on their faces when we come back?" 
:Hafnar: "You keep talking like you're sure we'll find something useful in here." 
:Girduin: "Given the history of this place, it's more than likely there's still some amount of power here." 
:Savos: "Enchanted weapons, tomes of ancient knowledge, Shalidor's secrets themselves -- who knows what we could find!" 
:Takes-In-Light: "And what if... What if there are things guarding this place?" 
:Atmah: "Against six College-trained mages? I think we'll be fine."

After their encounter with the skeletal dragon:

:Elvali: "We... we have to go back. We can't leave Girduin..." 
:Hafnar: "We barely made it out alive, and you want to go back in?" 
:Atmah: "It's too late. There isn't enough of him left to go back in after." 
:Takes-In-Light: "Gods, what have we done?" 
:Savos: "We can't go back. Might as well go forward. We can still do this." 
:Atmah: "Savos is right. We can make it if we just stay alert."

When you encounter the ghosts again near the end of the Labyrinthian Thoroughfare:

:Savos: "Come on, we can't stop now. We have to keep moving!" 
:Atmah: "Where's Elvali? She was right behind me."  
:Hafnar: "Dead. Something grabbed her from behind. Gone before I could do anything." 
:Takes-In-Light: "This is insanity. We never should've come here." 
:Atmah: "You're right. This is all my fault. Should we turn around, head back?" 
:Hafnar: "I don't think going back is a good idea." 
:Savos: "Going back would be the end of all of us. We keep pushing forward, and we'll make it. We will!" 
:Atmah: "Come on, you can make it. Let's go."

Just before the entrance to the final chamber of the ruin, the ghosts will appear again, this time without Takes-In-Light and all seemingly in acceptance that this will be their demise:

:Atmah: "We shouldn't have left her there to die!"
:Savos: "What else could we do? Stay there and die with her? She refused to go on, we didn't have a choice!"
:Hafnar: "This is it, you know. Through this door. Can you feel it?"
:Atmah: "We're not going to make it, are we?"
:Hafnar: "We stay together, no matter what. Agreed?"
:Atmah: "I'll be right with you."
:Savos: "Agreed. We all stay together."''