For example, providing information like "Vampires can only be killed by sunlight or nun's holy water."
Additionally, as a "Rascal" profession, Matthew possesses a bloodthirsty skill, which allows him to avoid areas where large numbers of monsters congregate. This too is a form of assistance.
In these times, more people mean more strength. If things really go south, isn't it good to have someone to serve as cannon fodder?
But Xu Shu declined for a simple reason: he just found it too much of a hassle. He had many secrets of his own, and while temporarily teaming up with others was fine, he didn't find it suitable for long-term travel together.
Like how he would occasionally disappear for the entire day during daylight hours—a situation that would inevitably be impossible to conceal if he were to spend a long time with others.
So it might be better to just go about his business alone.
