This brings me to the stronger possibility, an application of one of the powers someone here possesses. The paltry information on the device is almost more useless than the hope of applying my knowledge of poisons to your situation. Nonetheless, I would direct your attention to Kallamar, as "plague" and poison may well share a number of symptoms. Naturally the pharmaceutical knowledge of Baizhu should be suspect as well. "Status ailments" is notably vague, but

[ the letter is interrupted here! to be continued(?) ]