Is Something Wrong with Cultivating Immortality at Hogwarts?

Yun Huaijin, the most doted-on young master of an Eastern cultivation clan, made a mistake during a secret-realm trial and was transported, cultivation and all, into the world of Harry Potter.

While wizards wave their wands and chant spells, he just raises a hand and casts talismans and formations.

While potions require complicated brewing, he sets up a furnace on the spot and makes elixirs.

Just as he thought this was nothing more than a cross-dimensional social studies field trip, the merfolk prince with silver hair and blue eyes, regarded as an outsider by his people, wrapped his icy tail around him in the depths of the Black Lake. “The aura around you doesn't belong here. And you belong to me.”

From then on, Hogwarts went completely off the rails. While The Chosen One was still searching for Horcruxes, the cultivator was already beneath the lake, teaming up with the merfolk prince to purify the magical waterways.

Dumbledore: “Perhaps Eastern wisdom can bring us new hope.”

Voldemort: “Wait, why isn't this wizard(?) afraid of the Killing Curse?!”