The Ugly Girl is Chaos Queen

Aurora, the eldest daughter of the Northern Realm's lord, suffered relentless humiliation for her homely appearance and mediocre aptitude. She unexpectedly awakened the primal chaotic power within her, and under a grand master's guidance, reshaped her form and gained immense strength. Returning to settle old grievances, she defended the realm against invading dark forces, triumphing over darkness with her devotion to light. In the end, she relinquished power and set out on a journey to aid others with her mother.