Part 2 Becomes Part 1
UPDATE: Confirmation for EN.
Myrtle has been introduced on the Official KR and JP Twitter accounts, which means she will be arriving soon! For CN, she shared the [Forging Steel] Banner, along with Hellagur and Astesia. This Banner came as part of the summer event Heart of Surging Flame Part 2, which ran after the main summer Heart f Surging Flame Event. This re-ordering does make sense, in a way, as Hellagur was introduced to us already in the Operational Intelligence Event.
More Information on the Surging Flame Part 2 Event can be found on the Event Page here: