I was just picking out some spells for my nymph vampire, and it seems to me that Wall of Thorns is just about as NASTY a spell as they come.
I was thinking of having the nymph reside in a dark swamp somewhere, waiting alongside a green dragon.
The party heads into the swamp using divinations to try to locate the missing nymph and then ends up finding the dragon - a battle ensues, and the first thing the nymph does is encloses the party in a wall of thorns.
*shudder*
I have another rogue that I've turned into a vampire too (human lycanthrope, actually), so I have to figure out how I can have it so that she can journey with them without crossing all that water. The party has a habit of traveling with phantom steeds and floating disks, so as long as she rides on one of those, she should be fine.