Witch City was within close range, and after the City Protection Array had been breached, the entire city was defenseless. As long as one hid nearby, Divine Sense could enter without restriction.
The three Great Witches originally took turns guarding the entire city with their Divine Sense, constantly scanning the surroundings to prevent Wei Yuan's spies from peering in. But this time, it was Wei Yuan himself who had stealthily come to scout.
Wei Yuan's Primordial Spirit was formidable, and he concealed his aura, approaching to within less than three miles from Witch City before faintly arousing the Great Witches' awareness.
The Great Witches couldn't possibly maintain covering the city with Divine Sense at all times, it would be more feasible for a Ghost Witch.
