Arc 1The Snow Demon’s Arrival
Chlorine Sodium took Yelena in after the girl’s Originium Arts awakened, then drew Ursus’s attention through a series of destructive attacks. As Yelena settled in Chernobog, Chlorine Sodium confronted an Ursus force and faced a giant mecha sent to kill her.
- Chlorine Sodium escaped the Honkai world and arrived in a changed, smaller human form, while Yelena survived the destruction of her mine by awakening extreme-cold Originium Arts.
- Chlorine Sodium found Yelena in the forest, brought her to an empty village, and promised to help her live, while Yelena began calling her Big Sister.
- Chlorine Sodium trained Yelena to control her Arts and taught her close-range combat, then secretly unleashed Honkai Energy during an Infected uprising arranged with Koschei.
- Chlorine Sodium and Yelena traveled toward Chernobog, where Yelena recognized Chlorine Sodium in a newspaper image as the figure from the mine disaster.
- Chlorine Sodium exchanged intelligence with Koschei and learned of an unidentified device excavated near Chernobog, while Ursus officials prepared to counter the Snow Demon.
- Ursus forces gathered Infected for Operation Snow Removal, and Chlorine Sodium attacked a convoy as Yelena was confined in a camp where Infected were used as Arts mediums.
- Chlorine Sodium swallowed an artillery barrage through spatial gates and redirected it into the Ursus forces, then confronted Grand Duke Ivanov Kim Yuspov at Central Command.
- The deputy director released an awakened apostle in a giant mecha, which fired a crimson beam at Chlorine Sodium before surviving her counterattack and charging through the smoke.