C2431 Everyone Attack Southern Frontier!
First and foremost, the letter must have originated from the Southern Frontier, as it carried the distinct scent of a local herb.
It seems likely that this was an intentional clue left by the sender.
The signatory of the letter was none other than Ma Zhen, the Cult Leader of the Seven Poisons Cult!
Yet, Ma Zhen was known to have perished in the turmoil at Jing Capital