Judging from the previous spawn rate of Gargoyles, as a Commander-level monster, the total number of Banshees is probably only a fifth of that of Gargoyles.
The spawn rate of Gargoyles is 5%, meaning out of every 100 burrow monsters, there are 5 Gargoyles.
So the spawn rate of Banshees is likely 1%, with one appearing out of every 100 burrow monsters.
Estimating from the frequency of five spawning every three minutes, approximately one hour, which is 20 waves of burrow monsters, will refresh one Banshee.
Of course, this is speculation based on the spawn rate of Gargoyles, and it might not be accurate.
If this speculation is correct, then within at most half an hour, another Banshee could appear.
Zong Shen decided to wait at the frontline to check the attributes and true strength of the Earth Cavern Demon before deciding how to address this issue.
