Castti Ch.2 - Who was that hooded figure?

Just finished the second chapter of Castti in Octopath Travelers 2 and the mystery only deepens to be honest. The story itself was a standard one for this kind of character, war between two countries and doctors working both sides to save as many lives as possible.
The real interesting part comes from the inquiry you do to two characters to learn more about Castti past as she lost all her memories. Seems like there was a rumor going around that Eir's Apothecaries (the group Castti was part of) being involved into a village destruction through some purple rain.
Castti get a flashback though and it shows her trying to stop a hooded guy who activated this rain. Issue is that this hooded guy calls Castti "leader" and is actually a follower of the same group. Just what's going on with the Eir's Apothecaries? How did Castti lose her memories?