The grey compass, about the size of a washbasin, is precisely the Array Card for Yinsha's "Space Warning Array".
As it turns out, the reason such a thing is here is because Feng Jun last time disappeared directly from Rong Mountain and went to Jumu Market Town.
This leap startled the people of the Yinsha Sect, prompting them to later commission the Loose Cultivator Alliance to dispatch a large number of personnel to investigate.
Yinsha is very worried that Feng Jun might use this method to suddenly appear in the annex—though the possibility is low, who can guarantee it doesn't exist?
So the Yinsha Annex at Rong Mountain applied for such a Space Warning Array Card, which covers only Rong Mountain Square Market. The place where Feng Jun disappeared was already in the suburbs of the suburban market area, impossible for the warning array to be so large.
