The god of death gave Lucien a meaningful stare while wondering what to do next. The fact that this kid has a unique combat technique that allows him to retain his power even in the underworld meant he already has an advantage over the god of death. If he should ever reach a profound realm, he may be able to kill him. Why would the king of the underworld let such a threat go without trying to stop him before things escalate to a point where the situation is beyond his control.
"He is scared" Lucien's voice reached his ears causing the god of death to look up and look Lucien in the eyes.