Fate Testarossa - Fate in A's

Fate in A's

In A's, Fate and Arf join the Time-Space Administration Bureau, as a temporary mage, and go back to Earth to team up with Nanoha again. She arrives barely in time to save Nanoha who had just been beaten by Vita, Fate manages to hold Vita back until Signum arrives, where she is beaten as well, even having Bardiche cut in half, although Bardiche is easily fixed using the Recovery skill.

After escaping from the Guardian Knights, Nanoha introduces Fate to her friends, Arisa and Suzuka, as a transfer student (though they had already met via Nanoha and Fate's video messages), and Fate has to get used to civilian life on Earth, due to the situation, as the Asura was being repaired and the crew was living on Earth for the time being. She also has a new mother figure in Lindy Harlaown (who later adopts Fate). Early on in the season, Bardiche is upgraded, along with Nanoha's Raging Heart, to be able to compete with the Wolkenritter's Velka type weapons, and is renamed "Bardiche Assault" which also now uses the cartridge system similar to that of the Wolkenritters weapons.

Nanoha and Fate later in the season, meet a sickly girl, Hayate, after being introduced by Suzuka, who is actually the master of the book of darkness. Later by accident, when visiting Hayate who was hospitalised at the time, Fate and Nanoha meet the Wolkenritter, and find out that Hayate is the master of the Book of Darkness, and the reason why the Wolkenritter are collecting pages for the book. Fate and Nanoha face off against the Wolkenritter, who do not wish for them to leave knowing their master's identity. However, the match is interrupted by the two masked men (later revealed to be the Liese twins), who trap Fate and Nanoha in magical binds and a barrier and then impersonate them, to make Hayate think that it was Fate and Nanoha who killed the Wolkenritter (as the masked men used their Linker Cores to fill the last pages of the Book of Darkness).

Fate along with Nanoha are forced to fight Hayate, as the Book of Darkness. However, during the fight Suzuka and Arisa discover Nanoha and Fate's true identity when the duo are trying to protect them from the Book of Darkness' attack. Fate is later then captured by the Book of Darkness and thrown into a dream from which she will never want to wake; with a happy life with older sister Alicia and a sane, kind Precia. However, Fate remembers that her friends need her, and says a sad goodbye to the life she always wanted in favour of the life she has now. With the help of the Wolkenritter and Hayate herself, they cure both Hayate and the Book of Darkness, which transforms into Reinforce, Hayate's partner and weapon.

In an epilogue taking place six years later, Fate is older, has been adopted by Lindy, and working for the TSAB along with Nanoha and Hayate who are now junior high schoolers. She has now changed her name to Fate T. Harlaown, with the T an abbreviation for Testarossa.