The butler clashed with the Demon of Lust.
Drysdale was surprised to see this prince who left an impression to him. The demon was aware about the death of the Demon of Wrath and he thought that the demon was vanquished by the martial practitioners but Drysdale didn't expect to meet the prince who captured them, hundred years ago.
The death of Samuel might be related to the prince of demon. Drysdale admitted that Art was the only capable individual that could vanquish them. It might be doable for the cultivators to defeat them but their lives would be exchanged for it.