Giving the Western Demonic Cult a Taste of the Shock of Eastern Dark Cultivation

Give Voldemort a Taste of the Eastern Dark Cult

I'm looking for stories about Voldemort. Basically, an Eastern demonic cultivator arrives in the HP world and meets Voldemort. At first, they plan to have a friendly exchange, but then they realize Voldemort is child's play compared to people in the cultivation world. The protagonist tells him about Eastern cultivation, and Voldemort falls for them.