This plays at the end of the New Beginnings questline, the final chapter of the 10.2 Defenders of the Dream story which seems to unlock after defeating Fyrakk. This chapter focuses on the future of the Night Elves, rewarding the recolored heritage armor.
This cutscene takes place during the final quest Andu-falah-dor, which translates to “Let Balance Be Restored” in Darnassian. After celebrating the new beginnings for the Night Elves, we meet Ysera in contemplation by the moonwell. With her vows from the start of Dragonflight fulfilled, it is time for Ysera to return to Ardenweald and restore the balance.
Alexstraza: I am so grateful we had this time together.
Ysera: My beloved friends.
Ysera: With the aid of those gathered here.
Ysera: Amirdrassil blossoms all around us.
Ysera: Do you remember when you first held its seed in your arms, Tyrande?
Tyrande: Of course.
Tyrande: I cradled it as I would a child and promised the souls within to honor their sacrifice.
Ysera: And I swore to you I would do everything in my power to protect it.
Ysera: We have both kept our vows.
Ysera: It is time I return to Ardenweald to restore the balance and repay a debt to an old friend.
Merithra: Mother… I thought you came back to ensure that I would–
Ysera: My precious child. You are strong, compassionate, and wise. And you have become the leader I knew you would.
Ysera: You did not need me to guide you.
Merithra: Mother, I will always need you.
Ysera: I shall not be far.
Ysera: I am so, so proud of you, my heart.
Ysera: Remember–all time is borrowed.
Ysera: And in this, there is beauty.
