Daemon princes and ghosts are similar enough (if you're made entirely from the same thing that a soul effectively [i]is[/i], i.e. an imprint on the Immaterium) that Hakurouken would do [i]something[/i]. Since its effects are entirely mental, leading to a moment of nirvana (though that's extremely confusing for living people)...

Imagine making Magnus question his life choices every time it hits. xD