Dagail is a bosmer battlemage and head of the Mages Guild in Leyawiin.
She is a powerful mystic who often speaks of cryptic premonitions and without a certain amulet she is plagued by thousands of voices and unable to concentrate on anything. The original amulet was a family heirloom but was stolen by Kalthar who hates Dagail and wanted to see her removed as head of the Leyawiin Guild Hall.
Dagail has a brother, Eronor who is a stablehand at Weynon Priory. While Dagail is a bosmer her brother Eronor is a dunmer which implies they are half-siblings, having the same father but different mothers.
According to Kalthar, Dagail and Eronor’s father only managed to fit in anywhere by keeping a low profile and was in service to the empire for many years but never got so much as a "tombstone over his head".