Rules aside as well it's more the balance aspect. Consider how nasty a full power librarian could be with this if it could be used multiple times per turn. Lets imagine a rough average of say five degrees of success on opposed willpower (plucking number out the air) and if you could use it for every hit of lightning attack.
Three lots of five D10's. Anywhere between 5 and 50 damage ignoring armour and toughness with potentials on any of those 15 dice to Righteous Fury with an extra 1D10 damage if so. Probably again an average maybe say 90-100 damage (assuming an odd righteous) on ONE action.