"The Necromancer" aka "The Tale of the Black Forest"

 By Ludwig Flammenberg (pesudonym of Carl Friedrich Kahlert)

Here's a mixed genre fantasy tale way ahead of its time as published in 1794.  There was some confusion about the author, his pseudonym and the translator, all explained in the Wiki article.

From the Amazon.com description:  "'The hurricane was howling, the hailstones beating against windows, the hoarse croaking of the raven bidding adieu to autumn, and the weather-cock's dismal creaking joined with the mournful dirge of the solitary owl...'"

"The Necromancer consists of a series of interconnected stories, all centering on the enigmatic figure of Volkert the Necromancer. Filled with murder, ghosts, and dark magic, and featuring a delirious and dizzying plot that almost defies comprehension, The Necromancer is one of the strangest horror novels ever written.

"One of the earliest Gothic bestsellers, The Necromancer was first published in 1794, and after more than two centuries still retains the power to thrill and fascinate readers. This edition includes a new preface which reveals for the first time ever the true identity of The Necromancer's author, as well as an original critical essay by Jeffrey Cass, analysing the novel from a modern queer theory standpoint. The complete text of three contemporary reviews and helpful annotations are also included to further enhance this edition."

Amazon Link

Wiki Article Link