Sylvia is a genius ice-mage with snow-silver hair and eyes blue as a clear lake, the student and adopted granddaughter of Blundell Adrunkus, Master of the Blue Tower. Her natural gift for magic is so great that Blundell found her, lowborn, in an ordinary village and trained her in secret for years until she became the youngest prodigy of the Blue Tower. By the Student Tournament she is considered untouchable: she crushes opponents in seconds and holds first place, beyond the reach of her peers.
But behind her cold mask hides loneliness. From childhood not a single child would approach her: her silver hair and rare beauty woke the jealousy of the village girls, and her inexplicable gift set her apart from everyone. The elders and Blundell stood in for her parents but not for friends, and she built a 'wall' inside her heart, forgot how to reach out first and lost her smile. It was this psychological wall that long kept the young talent from crossing the 5th Circle — neither power nor mentors could break it.
The turning point comes in the Tournament final against Theodore. Through experience and clever tricks he beats her for the first time in her life — and in that fight, meeting a peer who neither fears nor envies her but keeps surprising her with his magic, Sylvia smiles sincerely for the first time since childhood. So her wall cracks and their friendship is born: she receives the title of baroness and the Frost Jack Staff from King Kurth III, becomes Theodore's companion on his journeys, for the first time pours out to someone everything she knows, and thaws beside him and his earth spirit Mithra.
When Theodore secretly leaves the capital for a year, Sylvia — concluding that he left because he thought her a weak burden — changes utterly: she trains in silence and with grim resolve, breaks through the 'wall' by sheer will and, with no 'cheat' tricks, takes first the 5th and then the 6th Circle. Grown up, she joins the Quatro team, fights at Theodore's side and becomes Veronica's romantic rival, hiding her love for five years. On the eastern continent the sin-grimoire Lust chooses Sylvia as the perfect vessel and seizes her — unlike Veronica, she has no protective contract with Theodore — and he is forced to wrest her from captivity.
In the finale, having inherited the title of Master of the Blue Tower and his staff from the aged Blundell, Sylvia answers 'yes' to Theodore's proposal, made to her and Veronica at once. At the 'Wedding of the Century,' officiated by King Kurth III himself, her silver is wed to Veronica's flame — two opposite elements joined by love. The girl who once built a wall around her heart laughs on her honeymoon, hiccups after wine and rests her head on Theodore's shoulder, and afterwards lives as one family with Veronica, without a shadow of jealousy.