"Blasphemy Trinity." "Three Brothers of the Shadows." "Knight" is one of them. He stands for fraud, libel, solicitation, and everything that is not true. A liar and a magician. In the "triple End" and "triple Fallen" it represents the abyss of all illusion, deception and delusion.

He actually enjoys seeing and throwing people into a frenzy of betrayal and nonsense. For those who wish to summon him, Summoners must articulate their ambitions and expectations during the ceremony. And he will be attracted to come and help you once. Anything he can do[But he would definitely betray you,or maybe he just threw you a hallucination.]