I suspect he talks about Dain and Aether? I am not sure but why is Dain comes to my head when he talks about a masked swordsman Dahri?
(If you play Aether does it say her? Means Lumine?)
The former Hydro Archon fought side with Greater Lord Rhukkadhevata, and the oceanids went to sumeru in search of their Archon and fight against the defiled beast, but fails to retrieved her.
This quest is good and the music is top tier!












