Isla was the former Pontiff of the Church of Lymilark, the one directly before Etain and the one responsible for training her. She was friends with Adelia, a priestess located in Tir Chonaill. While the Milletian does not directly meet them, she is presumed to be in charge of the Church until at least the events of Generation 16: Macbeth.
Adelia worked in Tir Chonaill at a time where the town constantly had to fend off attacks, and Isla's later years were troubled by regrets of having failed to prevent the death of Adelia when she sacrificed herself to save her village. One of her only solaces was her hobby with Glyphwrighting, though the Church of Lymilark does not publicly recognize her work in that field.
Isla has likely authored multiple books:
- Using the Adelia Stream Keyword on Etain reveals that Isla would sometimes visit Tir Chonaill after Adelia's death; Isla spent long hours into the night speaking with Pencast after these trips.
- Using the Classes and Training Keyword on Enya reveals that Isla sent Corentin to save Enya during the closing events of Generation 16: Macbeth after receiving a prophetic dream.
- Using the Lute Keyword on Enya reveals that Isla likely played the instrument, as an old one sits in the depths of the sanctum.