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Frenica Szeski (フレニカ・シェスキ,Furenika Shesuki?) is a supporting character in the Alicization Arc. She was a student at the Sword Mastery Academy in North Centoria in Underworld, where she served as the valet of Elite Disciple Humbert Zizek. Frenica participated in the battle at the Great Eastern Gate as a nun-in-training, later joining the Human Guardian Army's decoy unit on their journey to the Dark Territory to draw the Dark Territory Army away from the Human Empire.
Frenica has short, light-brown hair, and pale skin. She appears frail and thin, seemingly unsuited for wielding a sword, were it not for the fact that one's appearance mattered very little in Underworld.
Frenica is a nice, yet humble girl who is skilled with swords but too timid to fight for herself.
At the beginning of the school year at the Sword Mastery Academy, Frenica was chosen to be a valet to Humbert Zizek. Frenica's mentor was a strict person who, after drawing in a duel with Eugeo, started punishing his valet for long periods of time for minor blunders and was even ordered to provide services to her mentor that should be considered inappropriate, while still barely keeping within the rules of the school. She told this to her friends, including Ronye Arabel and Tiese Shtolienen, the valets of Kirito and Eugeo, respectively. The two girls in turn, informed their mentors.
This, however, was a ploy by Humbert and his friend, Raios Antinous, a 3rd class noble, to take revenge on Eugeo. The two nobles practically ignored Eugeo's and Kirito's request to cease Humbert's harassment of Frenica. This led to Ronye and Tiese getting directly involved, after Frenica told the two girls she would quit if it continued. This was Humbert's and Raios's original intention, as they were able to exercise their authority as Higher Class Noblemen, over the Low Class Nobles, and provide whatever sort of punishment they wished to them, under the notion that the two were being disrespectful, and threatening to spread defaming information about the two.
After the two left the dorms, Frenica went to thank Eugeo for trying to help. She then explained that Humbert continued to harass her, and said that Ronye and Tiese had since left to confront the two, an hour before. This led Eugeo to realize the true intent of the two nobles: they were not trying to get to Eugeo directly, but rather, they were trying to get to him through both Ronye and Tiese.