Frost's childhood was mostly spent training after that incident and her hatred towards men (who's not her family, she barely treats the body guards at home as passing). She held the katana in hand as she ignored Scorpio who was trying to get her attention. Rather she heard a crying voice yell no at her in her head as she sliced someone in half. Her hand moved instinctively as she ignored the screams and yells threatening her head. She sliced this one through the stomach without showing any emotions as if it were normal. This was easy for her because the Realms were a much harsher place than the worlds. The worlds in which her sister lives in were easier to live in, sure there were threats such as beasts and monsters.
But in the Realms there were beasts, monsters and parasites that could easily kill you if you were off guard. So she hated how easy going her idiotic sister was. A naive little girl who was spoiled since birth. Frost was the same too until her kidnapping incident and she then did things herself. Also trained herself daily to protect herself. She stabbed a tall bandit with her sword without caring about his shouts. Frost nodded satisfied when she saw that was the last of them. Unlike her half sister's best friend who hated to the point she tormented them alive. (She threw up at the sight.) Seeing her have her victims (men) alive as she opened their head and poked at their brains until they died. (You can guess why she threw up. And her half older sister's friend is ok, but if men tried to get friendly with her they end up dead afterwards. She hates all men.)
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A amused smile appeared on Frost's mouth. Since she left the women alone she had a plan already. She could still do possession but it be more amusing to do it with Cecilia herself and her just controlling her arms and body not her face or head. (She's being mischievous here)
"No! Wait stop." (Cecilia)
Her screams became louder as she noticed Frost bringing her to the store room with the sword in hand. She knew why they were here. The women and children that the bandits took were here. That person purposely did so and she had (just relived her memories again) just come to and shouting no loudly into the night.
Her sister actually wanted her to get used to how the world was unfair to them. Not everything was easily handed to them on a silver platter, she wanted Cecilia to get used to getting blood on her hand to protect herself.