That's a Necromancy spell isn't? I doubt a vampire would be dumb enough to attack a mage that can bind and control the undead.
I think I get your meaning. If magic and vampires did exist. There is no way you would venture the world outside, without a kit of some kind in dealing with the undead. "Be Prepared."
The parameters were to stop a vampire with non-holy magic. Everything else wasn't part of the scope.
Additionally, slap this on any death spell. http://www.d20pfsrd.com/feats/metamagic-feats/thanatopic-spell-metamagic/
what does it mean to suppress the life force? the target is not only hurt but can't heal or be healed either? Are they slowly losing health? damage over time kind of thing?