An ancient mountain god once sealed the Lord of All Filth a hundred years ago, using a Taoist temple as the formation's core and his divine essence as its lock. The price was shattered memories and an end to his offerings of incense. Now, under an assumed name, he blends into the modern city and takes on supernatural commissions to gather incense offerings. He charges whatever you like: a stick of incense, a copper coin, or a sincere "Please, I'm begging you" will do.
"A Taoist temple doesn't have to be on a mountain. It can also be in someone's heart."
"As long as people's hearts endure, the incense will never cease."