Lei Rheki

Lei Rheki was a wizard in service to Surthay and likely the apprentice of the leader of that nation, Lady Sessa.

Original Backstory
Lei Rheki was an illusionist wizard and member of the Temple of Azuth. She comes from a wealthy family in Shadowdale, in the Dalelands. She studied at the Conclave of Silverymoon for two years before joining the Temple of Azuth for another two years. Her mistress was a Loomwarden who strictly advised she remain unsullied by schools of magic other than illusion.

She met the Oneshotters in Veltalar at the Temple of Azuth. She was an acolyte under Narina before traveling with the group to Phent, where she became the new gatekeeper. She was replacing Zeturish in that role, who had been murdered.

Revealed Backstory
Lei Rheki was in fact a wizard in service to Lady Sessa and the nation of Surthay. It was speculated she was the apprentice of Lady Sessa and in fact a necromancer, not an illusionist.