Aicantar

 is a resident of Understone Keep in Markarth. He helps his uncle, Calcelmo, in his uncle's laboratory.

Interactions
During the quest Hard Answers, in Calcelmo's Tower, Aicantar becomes hostile and starts attacking the Dragonborn. Killing him may fail one of Sergius Turrianus' "fetch" quests, if the target is Aicantar. The Dragonborn could, however, just run past him and come back another time to Markarth. Upon returning, Aicantar is no longer hostile.

Creations
He is the creator of Aicantar's Spider, and the Spider Control Rod which commands it. Aicantar's Spider is a Dwemer spider which has been modified so that it can be controlled by the person using the Spider Control Rod.