The sentence left on the gate was meant to sow chaos. Whether the sentence was telling the truth or not, the sentence would plant the seed of suspicion inside their hearts, slowly breaking up their temporary union from within.
"This does appear like what the shadow would do, so he probably really did leave this behind." Jia Ming nudged Lee Zheng's shoulder. "He likes to hide the truth in the lie and the lie in the truth—the shadow is very good at psychological tricks like that. It's not dissimilar to people who tell you what they'll play during rock-paper-scissors. The shadow has a penchant for psychological warfare. He has possessed innumerable people, seen the darkness inside many people's hearts, and lived through endless lives; he is a psychological master that no one can surpass."