Votus Titonian at the Ebon Tower of Old Ebonheart told me about a vengeful spirit that is currently haunting Stendarr's Tower. I agreed to try to exorcise it. He suggested I talk to either Helice Rastin in Arkay's Tower or Memistean Fellux in Akatosh's Tower. I could also ask at the Old Ebonheart Mages Guild.
Stendarr Tower Haunting
Helice Rastin recommended that I use Turn Undead on the Stendarr's Tower ghost, although Conjuration magic hasn't worked on it in the past.
Memistean Fellux suggested using magic or a silver or better quality weapon to banish the ghost, though he warned me that they've been unsuccessful in banishing the ghost using those methods.
Cellitara in the Old Ebonheart Mages Guild suggested I try to talk to the ghost after using a Calm Creature spell on it. The enchanter Yuaile Phyroc may have a scroll to suit that purpose. Cellitara also suggested talking to Hastophos Velifer, who may know more about dealing with the undead.
Hastophos Velifer suggested soul trapping the spirit to remove it from Stendarr's Tower.
The ghost said that dark idols are spreading corruption throughout the city. He asked me to find those who bear these idols and either kill them or find some other way to take the idols.
Votus Titonian recognized the dark idols as Dark Elf statues being sold by a Bosmer named Cirtiel near the docks.
Cirtiel agreed to stop selling the ash statues. She still has one statue for sale, and she said she sold three statues to Imperials in Old Ebonheart: One to Votus Titonian, one to Quercus Duro at the resettlement office, and one to Arnos Clatian. Her supplier is the shipmaster of the Pride of Narusia.
I spoke to the Pride of Narusia's shipmaster, Haldroth, but he refused to stop supplying the statues.
Votus Titonian agreed to request that the Dark Elf ash statues be declared an illegal trade good within Imperial jurisdiction and that Imperial patrols be increased in the Thirr delta.
I gave the Indoril ghost the four statues that were spreading corruption, and the spirit is finally at peace. In return, it gave me its signet ring.
I succeeded in soul-trapping the ghost haunting Stendarr's Tower.
Votus Titonian rewarded me for my efforts.
Arnos Clatian gave me his ash statue.
Quercus Duro gave me his ash statue.