The Enterprise of Death by Jesse Bullington

Goodreads Storygraph

"As the witch-pyres of the Spanish Inquisition blanket Renaissance Europe in a moral haze, a young African slave finds herself the unwilling apprentice of an ancient necromancer. Unfortunately, quitting his company proves even more hazardous than remaining his pupil when she is afflicted with a terrible curse. Yet salvation may lie in a mysterious tome her tutor has hidden somewhere on the war-torn continent. She sets out on a seemingly impossible journey to find the book, never suspecting her fate is tied to three the artist Niklaus Manuel Deutsch, the alchemist Dr. Paracelsus, and a gun-slinging Dutch mercenary. As Manuel paints her macabre story on canvas, plank, and church wall, the young apprentice becomes increasingly aware that death might be the least of her concerns."

gross, gay, and funny. it's not the best book I've ever read, but if you'd like to read about lesbian necromancers in the spanish inquisition, this book does have all those things! but it is very gross. like, very very gross.