Causing great trouble refers to the infamous third BOSS of the Westminster Cathedral incident, Mind Controller Xiao Song.
He is considered a half Undead Mage and also a brainwasher for the Cultists.
Unlike the previous Gatekeeper and Celestial Destiny Tree Man, his abilities are more diverse.
He possesses the ability to control other people's minds, making them fight like the Undead, and also has the skills of an Undead Mage, reviving corpses to fight for him.
But his true strength lies in using Undead and Mind Type spells to deceive and intimidate his enemies, wearing down their will until they meet their demise.
It can be said that his methods are unique even among the Cultists.
The average person has no idea of his capabilities, assuming he possesses both magic and martial skills, not realizing that he works through deception.
To ensure his combat style remains hidden, he adheres to the rule that anyone who witnesses his actions must die.
