Background unknown, Katreda was born to Asnabel Birall and an unknown mother.
Residing in the town Cayes in Gunther Piedmont, Katreda worries about her father, who goes to the Mine to stay the invasion of the Western Division. As a co-conspirator of the revolution among the miners, she is forced to stay behind and look over villagers, as her father believes it is too dangerous for her to engage in battle. When Magus Gallant or one of his units from the Blue Knightsbattalion liberates the town of Cayes, Katreda quickly offers her assistance, hoping to rescue her father. Succeeding in doing so, Katreda and Asnabel offer to join the Revolutionary Army, fighting alongside Magnus to their deaths.