At a young age, Elsa realized that she holds an ancient ability over ice and snow, and often used her abilities to play with her younger sister Anna. Elsa shared a close bond with her free-spirited younger sibling, and the two were the best of friends. They often at night would make it snow in the royal ballroom. However, one night while the two were playing in the ballroom, Anna falls down from the high snow slopes Elsa had created. Elsa tries to save her by using her magic, but accidentally strikes her sister instead.
Their parents, the King and Queen, immediately seek aid for Anna by visiting the legendary trolls, whose leader, a shaman named Pabbie, is able to stabilize Anna's condition since it had only affected the head, not the heart, which would have been fatal. To be safe, Pabbie then removes Anna's knowledge and memories of magic, much to Elsa's despair. Pabbie takes the time to explain the true strength of Elsa's abilities, telling her there's not only beauty in it, but danger, and that she must learn to control them at all cost, or fear will be her enemy.
While the King promises to help Elsa control her powers, the incident leaves Elsa traumatized by them. As a result, the King and Queen order the gates to be locked for Elsa and Anna's safety. From then on, Elsa forcibly spent the rest of her life distanced from the kingdom, including Anna, trying to keep her powers from growing out of control and harming those she cares about. Even so, the persistent Anna tried time and time again to spend some quality time with her sister, but failed at every turn, leading her to eventually believe Elsa despised her.
