During the previous siege of Northern Border City by the Barbarian Tribes, they too had used this method to attack the city, attempting to completely deplete the Source Crystals that sustained the Protective City Formation. Unfortunately, at that time, Northern Border City was filled with powerful individuals, and Elite Troops were plentiful.
The Protective City Formation didn't even need to be activated; the high-level cultivators inside the city could shatter these projectiles in the air.
However, now the city is virtually empty, and facing such a barrage, they can only rely on the city's defensive formation for protection, which consumes an immense amount of Origin Qi every moment.
The cost of attack and defense is not on the same scale.
Draining his cup in one gulp, Xu Yuan stood up without further delay:
"If that's the case, then let's depart."
Li Junqing cast one more silent glance towards the south of the city and stood up as well.
Without another word,
