Back at home, when he has time to examine it more closely, it quickly becomes obvious why this ritual never turned up in all his early research. It's not a typical soul summoning ritual. It's not a cultivation ritual at all; as Nie Huaisang puzzles through it, the closest category he can put it in is folk magic...not only that, but sex magic.

Huaisang ran his fingers up over Mingjue’s thigh and abdomen, smoothing in slow circles as he spoke, “Just relax, Da-ge. I’ll take good care of you.”