So, i haven't actually read the novel, but had seen it being mentioned in the forgotten title tag. I read the message and was interested in reading it, then i forgot the novel title. What i remember is that mcis in another subspace or something looking for something and he gives the control of his body to a spirit (probably greed ) and when the spirits finishes finding it, he takes his body back. I think it was Lord of the Mysteries but I'm not too sure.