The Healer Who Was Banished from His Party, Is, in Fact, the Strongest season 1 episode 12
Episode title: Regarding the Conclusion, Which Was, in Fact, the Start of a New Journey
With the evil dragon now inhabiting Mist's body, the second wave of the uprising approaches Mardat. Laust and his companions fight to defend the city, but when they find themselves overwhelmed by the dragon's powers, Narsena decides to sacrifice herself.
