The spell is part of a sourcebook called "Exalted Deeds".
And It's really high ranking so....
And as for the paladin, I think that's kind of amusing.
.. Though... all you really need to fix a succubus is a Helm of Opposite Alignment.
It's a cursed item.
Guess what it does! :D
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather