Clearly, this question was perfectly answered by Stelle, and Feixiao approved, then asked further.
Feixiao: "Next, the report mentions that Dan Shu, the ringleader of the Disciples of Sanctus Medicus, harbored evil intentions, colluded with a Lord Ravager, and used a Stellaron to revive the Ambrosial Arbor. Yet Dan Shu was merely a Master Alchemist; to think she had such reach. It is one thing for her to collude with foreign enemies and summon a Stellaron, but the primordial Ambrosial Arbor is the territory of the Vidvida. How did she bypass the guards?"
Fortunately, Stelle happened to know the answer to this question, having met Dan Shu before.
Chapter 179