Arc 4Echoes Across Eras
The quiz and Death Space brought Herrschers and Flame-Chasers together as they revisited the tragedies of Wendy, Sakura, and Rin and followed Su’s return to the Previous Era. The stretch ended with Durandal receiving a Mirror Space card and fighting her own reflection after the group exposed Otto’s cross-dressing scandal.
- Theresa revealed Schicksal’s plan to capture Wendy, and Kiana challenged Durandal with a Concept Card that copied her power.
- Wendy’s footage showed Cocolia ordering Bronya and Heavy Machinery Rabbit to target her, and Titan Mechs defeated Wendy while she fought alongside Kiana and Raiden Mei.
- Kiana won a table tennis contest against Liliya, Bronya, and Fu Hua, while Fu Hua’s final shot punched through Earth and hit Z Siegfried.
- Chakravartin used a Life Coin to send Sakura back to her timeline, where she searched for Rin, challenged Kevin, and died after asking Seele to keep protecting someone and believe in hope.
- Sakura later used her Fire Moth authority to reach Rin, while Bronya learned that Joachim was a fragment of Welt Yang and that Seele might be lost in the Sea of Quanta.
- Welt entered the Eye of the Abyss with Einstein, but a spatial collapse separated them and left Einstein alone in an abnormal gravity environment.
- Fu Hua tricked the Herrscher of Reason into lending her authority to rescue Kiana and the others, then signed an agreement promising Fenghuang Down and that she would not trick her again.
- Su returned to the Previous Era with a Life Coin, gave Durandal a leaf that granted her golden armor and Sea of Quanta travel, then died after guiding Otto toward the complete Second Divine Key.
- Elysia recruited Su to work on a Honkai Energy Serum after explaining that Flame-Chasers judged danger by Su’s reactions, while Theresa’s school disguise was exposed and her height penalty reduced it by one centimeter.
- Durandal correctly guessed that Otto had once cross-dressed, won a Mirror Space card, and fought her identical reflection as the group laughed at Otto’s photograph.