Supporting Character's Cultivation: Rising from a Sect Ancestor

The night before Xu Yi became the senior sister of Xuanji Sect, she had a dream. In the dream, she was consumed by jealousy towards the newly arrived junior sister and committed numerous evil deeds, only to end up in a miserable and wretched state. As the day for the junior sister's initiation approached, Xu Yi closed her eyes and clenched her teeth. Carrying all her belongings, she left the sect to seek refuge. Little did she know that right after leaving the sect, she would fall into a hidden realm and be trapped there for two hundred years. After two hundred years, she finally managed to escape from the hidden realm. To her astonishment, she discovered that the outside world had already passed two thousand years, and the junior sister had long ascended, while she herself had transformed into the founder of Xuanji Sect...