Amon sneaked into Mo Wang's castle from one of the openings inside the many balconies around the castle. Despite the place being the residence of the ruler of the realm, there was no barrier preventing one from entering. It was precisely because of Mo Wang being the realm ruler that he believed his castle didn't need a barrier. No one would be foolish enough to trespass on his property. Even the Domain Lords chose to announce themselves and wait for permission before entering, as had been proven when Amon joined the Lord's meeting.
Amon was thankful for Mo Wang's haughtiness. This eased his infiltration. He, however, knew that Mo Wang had a surveillance enhancement inside his castle to detect intruders, which was proven by how he caught all of Dao Su's bugs Amon sent to survey the castle. Hence, Amon kept the concealment prism close by.
