Forced to display his true power
The eighteen Devil Lords and Blood Child descended to the ground and stood at the underground tower's entrance.
"We need to completely hide our presence from the Blood Duke and the other two warriors, or else the entire plan will fail. Since we are all together, it is impossible to hide our combined energy radiation. Beneath us is the tower where I have lived for a long time, and it has cloaking mechanisms that an enraged individual's consciousness can not overcome."
Blood Child's words made perfect sense, and the Devil Lords understood the logic behind his instructions, but none of them entered the tunnel that led to the tower.
Blindly follow the orders of a man they did not know and entering a place that could very well be a trap was not something a devil would do willingly.