Corpse-stained Manuscript is a book written by Zombie Jake that can be found in a chest (near the southwest corner of Jake's room) at the Eerie Undercroft under Madame Eve's brothel in Aleroth during the events of Divinity II: Flames of Vengeance.

Finally! Finally! I will be invincible! It took me years to gain access to the Forbidden Archives in this blasted Prancing Seahorse, but I finally managed to infiltrate and I have the spell! The spell of Corpse Binding. With it, I cannot be stopped: nothing can hurt me! All I need to do now is kill a handful of people, four should do the trick. Bring their bodies down here. Bury them. Cast the spell and voila! This altar will protect me, channel all the damage inflicted on me to their corpses instead of mine! This plan is flawless: nobody will find the location of the altar, so I will be unstoppable! The only thing that could break the spell would be if someone unearthed the bodies and sent them to the Hall of Echoes by slaying them. But they're well hidden among all those graves, hehehehe...

– Corpse-stained Manuscript, Divinity II: Flames of Vengeance