So I'm the DM in a campaign (which I know gives me a lot of leeway) but I try to stick as close to the books as I can. One of the NPCs attuned to the Book of Vile Darkness, and failed the associated charisma save, so is now of neutral evil alignment.
One of the PCs is related to and will likely want to save this NPC without killing them. So my question is, are there any RAW ways for the party to change the alignment of an NPC?
In our campaign alignment has played a fairly large role, with some creatures fighting against their upbringing to become good when shown mercy and care by the party. However, I feel like a magical change of alignment can't simply be overcome by being nice to them. Since becoming evil, the NPC has become a lich and is attempting a ritual to steal the souls of various creatures to become even stronger. So the NPC is all in on being evil now, which is why I'm looking for a way for the party to undo the alignment change.