Skyrim:Aicantar

Aicantar is a High Elf conjurer, and is the nephew of Calcelmo. 

Like his uncle, Aicantar is heavily involved in Dwemer research, where he often spends time by his uncle's side or, in some cases, in Calcelmo's Dwemer Museum. However, he does not share all of his uncle's zeal for research. 

He wears blue mage robes and a pair of boots, and is equipped with an iron dagger. He carries a key to the Dwemer Museum, a key to Nchuand-Zel, and a selection of common loot and gold. 

He normally remains in Understone Keep with his uncle.

During the quest Hard Answers, Aicantar will be present at Calcelmo's Laboratory, where unlike the guards, he will not be hostile, but evidently distressed by your breaking in. However, once you reach the Wizard's Tower, he will arrive with Captain Aquilius and two Wizard's Guards after you have duplicated the writing on Calcelmo's Stone, having alerted them to the presence of an intruder. All four will be hostile to you on sight, but you may choose not to engage them and run outside, as they will not follow. He will remain in the tower until the next quest in the Thieves Guild questline begins. Provided he is still alive following Hard Answers, he will return to his normal place at Calcelmo's side and will not remember your presence in the laboratory.
  
Related Quests
 
 
Quest-Related Events
Hard Answers
When you enter Calcelmo's Tower you can overhear him talking to the guards:

:'''Wizard's Guard: "Sir, are you serious?"
:Aicantar: "You heard me, captain- our work must not be disturbed. Kill any intruders on sight. Call for backup if you need it. But let no one through."
:Wizard's Guard: "...As you say, sir."''

When you make a rubbing of Calcelmo's Stone, Aicantar will burst into the room with his guards and Captain Aquilius:
:Aicantar: ''"Accidents like this just don't happen. Someone is trying to sabotage my uncle's research."
:Aquilius: "I...all right. If there is a thief, he won't leave this tower alive. But shouldn't we inform Master Calcelmo?"
:Aicantar: "I'll deal with my uncle. Just...go! Scour this place from top to bottom!"
:Aquilius: "All right men, spread out and search the tower. No telling who - or what - we're dealing with here."

Dialogue
When spoken to he can say:
:"I'm Calcelmo's nephew. I help him around the laboratory." 
:"Don't let my uncle go on about his theories. You'll be here all night."
:"I try not to think about how my uncle got all the Dwemer Centurion parts." 
:"I'm afraid to touch half of the things we keep in the tower."

When exiting a conversation he can say: 
:"Goodbye. Be careful if you head into the ruins."
:"Back to my studies, then." 

Conversations

Aicantar may also be seen having random conversations with his uncle: 

Aicantar: "Uncle Calcelmo...." 
Calcelmo: "What is it nephew? Can't you see I'm trying to think here?"  
Aicantar: "I just wanted to know if you needed anything." 
Calcelmo: "Um, no. Nothing. Nothing at all." 
Aicantar: "Are you sure?" 
Calcelmo: "Stop bothering me  !" 

Calcelmo: "Next season, nephew. Next season for sure...."  
Aicantar: ""Next season for sure..." What? Uncle Calcelmo, I don't understand what you mean." 
Calcelmo: "The excavation, Aicantar! Right after I finish my book. We'll start excavating Nchuand-Zel again." 
Aicantar: "Could I maybe, skip the excavation, Uncle Calcelmo? I, uh, I just think you won't need me." 
Calcelmo: "Nonsense, you're a vital part of my research team. You'll be there, have no fear! Now, I don't want to hear another word of protest."''

Spells
Aicantar knows the following spells:
Alteration
Oakflesh
Stoneflesh
Conjuration
Conjure Flame Atronach
Raise Zombie
Reanimate Corpse
Destruction
Chain Lightning
Fireball
Firebolt
Lightning Bolt
Incinerate
Thunderbolt
Restoration
Close Wounds
Fast Healing
Steadfast Ward 

Notes
After the Hard Answers quest is finished, he may sometimes not rejoin Calcelmo in Understone Keep, instead remaining in the Wizard's Tower for the rest of the game. 
Aicantar is identified as the backup Court Wizard, in case Calcelmo dies. However, since Calcelmo is essential and doesn't have a scripted death, Aicantar never provides merchant services during normal gameplay.
He has set of dialogue that comes with his new position. He would instead greet you with: "Oh, excuse me. With my uncle gone, things are a bit of a mess." He would offer a look at his wares with: "Did you need something? A staff? Some enchanting materials?" or ''"I'm not half the wizard my uncle was, but I still have a few spells worth buying." 
If you reanimate Aicantar then lose him, he may reappear from thin air and drop dead after Hard Answers is complete. 
Adopted male children who are living in Markarth may comment "Aicantar let me see his museum. It's really nice."
The author of Before the Ages of Man'' is named Aicantar of Shimerene. However, they are likely not the same person, as Aicantar of Shimmerene was the "Sapiarch of Indoctrination" and authored propaganda for the First Aldmeri Dominion in the mid-Second Era.