Mistress Therana is a Dunmer mage with a tower in Tel Branora and is a somewhat insane Telvanni Councilor who can become volatile quickly. She seems to have no material awareness and will hugely over-reward for mundane tasks. She keeps a naked Khajiit slave, Ra'Zahr, in her room, and her stronghold is decorated with rotting Kwama eggs.
She ignores everyone, preferring to talk extensively about herself, leading many people, including those in her own House, to want her dead. Other Telvanni Councilors often comment about how Therana has not aged well, and how she becomes more eccentric by the day.