"Ghost species" belong to a class of mutated spirits that are rare but also very tricky.
Their means of attack are often psychological, with low-level creatures creating auditory and visual hallucinations, affecting the target's sanity and judgment; higher-level ones directly control a person's limbs until they die, like Pestoya did before.
But Su Lun was no longer the clueless newcomer he was when he first crossed over.
He knew that even for ghost species to control someone, it was related to spiritual power. The weaker the target's spiritual power, the easier they were to control. This was also why many evil spirits chose to frighten humans first, rather than just killing them outright. It wasn't because they took pleasure in scaring people, but because healthy and calm humans were difficult to control. Only by scaring them, causing their SAN value to continue to drop, could they reach the critical point of control.
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