As for the Honkai: Star Rail Echo of War: Salutations of Ashen Dreams boss, Harmonious Choir: The Great Septimus will give people the chance to get six Light Cones, as well as Relic set items and a new Trace Material.
During the 2.2 Honkai: Star Rail Special Program, we learned about the upcoming Harmonious Choir: The Great Septimus Echo of War boss Salutations of Ashen Dreams, and now we know the rewards it drops.
Honkai: Star Rail is available on the PS5, PC, and mobile devices, and the 2.2 update arrives on May 8, 2024.
The Trace Material is Lost Echo of the Shared Wish, which we can probably expect Boothill and Robin to both use.