When you beat Arcade or Extra Arcade Mode with Talim, you get her ending. Warning! If you haven't seen Talim's ending yet, this is a big spoiler!

In order to restore the world to its original state, Talim returned the sword to its rightful place. The hellfire lost its sustenance. In the blink of an eye, it changed its form and scattered into the winds. The spiritual energies led astray righted their course and flowed toward this place. Talim must have sensed the change in the winds, for she looked to the sky and smiled.