He indeed had methods, but he also needed the consent of this individual, for the process was extremely painful. It would be difficult for an ordinary person to withstand, and the stronger one's cultivation, the more pain they would endure.
As soon as Gu Lan's words fell, Shadow Slave fell into deep thought. Although he had been a slave, he still took pride in being part of the Dark Clan.
Seeing this, Gu Lan didn't mind too much. After all, this person was a member of the Dark Clan. It wasn't easy for him to abandon such an identity, and it was understandable that he felt some resistance.
With a calm expression, Gu Lan glanced at him and spoke slowly, "If you're unwilling, that's fine, but next time, I can't guarantee you'll survive."
At this, Gu Lan's expression turned cold, and his eyes darkened—he was clearly not joking.