She was born in Deepwoods, a small village in the Malabal Tor region of Valenwood. Unlike previous Green Ladies, Finoriell was granted the position quite late in life, while she was living in Velyn Harbor. As the Green Lady, she became the embodiment of the physical side of the Bosmer, granting her supernatural fighting prowess and the "swiftness of the Green", the ability to cover vast distances in very little time. As is customary, she was married to the Silvenar, Edhelorn, at a handfasting ceremony in the city of Silvenar. Finoriell was known to love Edhelorn dearly.
In 2E 582, the Bosmer entered into an alliance with the Khajiit and Altmer under Queen Ayrenn, forming the first Aldmeri Dominion. As representatives of the Bosmer people, the Silvenar and the Green Lady served as ambassadors. During a diplomatic visit to the small island of Khenarthi's Roost, the Maormer inhabitants attempted to prevent the island's Khajiit from joining the Dominion by assassinating Edhelorn with Daedric poison. With the death of her Silvenar, Finoriell was doomed to follow suit. She flew into a rage, tracking down Edhelorn's assassin and revealing the Maormer plot, which saved the city of Mistral from destruction and convinced the Khajiit of Khenarthi's Roost to join the Dominion.
Unwilling to die without extracting vengeance upon her husband's killers, Finoriell swam the whole way to the southern continent of Pyandonea. She visited her wrath upon the Maormer, killing indiscriminately until she was spent. As she lay dying atop the highest sea-tower, the Sea Elves' greatest warrior came to claim her head as a trophy. Instead, she grabbed him and threw herself to the waves far below. Her niece Gwaering replaced her as the next Green Lady.
In death, her soul journeyed back to Malabal Tor, to the sacred grove of Treehenge so that her soul could be "rooted". All incarnations of the Green Lady, known as "matrons" in death, root themselves at Treehenge to ensure the Green Lady's past memories are preserved. However, Finoriell's soul was unable to find its way to the grove due to the Worm Cult, who had invaded Treehenge to steal the rooted souls of past Green Ladies. Despite the help of the matrons and the guardian spriggans, Finoriell's soul was trapped and weakened by the Worm Cult, who attempted to corrupt her so that she would kill the Treehenge when rooted. Before she faded completely, Finoriell was rescued by the Soulless One and was able to root herself using the lifeforce of Hengekeeper Lara. She grew to become a sprout, and helped the other matrons drive out the Worm Cult before going to sleep.
- For game-specific information, see the ESO article.