I can’t really explain why as it would require a deep, deep delve into our campaign’s lore, but our party needs to find the way to change the alignment of an NPC.
He’s a homebrew nephilim that was more or less born and bred for war and evil, and has always had the alignment of lawful evil. Recently, he spent time in the Beastlands and his alignment changed to neutral evil.
Whatever we do, we would almost certainly have to do by force, as he is not going to change by choice. We’ve looked around, but have been having trouble with the “force” part.
How can our party forcibly change this NPC's alignment?