Oh no! A nymph!!! Run!

[Pielorinho]

Yep--always always entangle. Try to attack at night, and use faerie fire. Produce flames should be the primary means of dealing damage. Consider having an area previously prepared with Plant Growth: the nymph can pick people off from a distance as they hack their way through it.

For flavor reasons, though, prepare as many of her second-level slots as possible with Charm Person or Animal, and use that to the hilt. Find individual members of the group, charm them before the battle, and divide and conquer.

Daniel

 

[VirgilCaine]

Add the giant vermin spell and this same poor soul with the bad Fort save could be in real trouble.

Check out the "Whats Bugging You?" Random Encounter on the WotC site for more verminy goodness--rules for vermin animal companions and entomanothropes (like lycanthropes, but for vermin).

 

[kigmatzomat]

In the harass and torment version of nasty, give the nymph Animal Defiance. It basically lets you "turn" animals. Nothing like scattering their mounts to the winds. It also works on summoned animals and, IIRC, animal companions so it's an amazingly effective trick in a druid vs. druid situation. Nymphs have a high charisma so it is very effective.

Other brutal stunts to pull are to sneak Fire Seeds into their gear. Nothing like a free action to detonate d8+level hp of fire damage on people. Set it up right and you'll injure their mounts too, forcing ride checks. With 8 holly berries you can be sure the entire group is injured, bleeding away the clerics healing magics.

Nymphs and druids in general should plan on hit and run tactics. Druids are incredibly mobile since they can make hedgerows and other permanent plant-based barriers that they can pass through with impunity. They can't be tracked and they could be anything you see, from a dead tree to that raccoon. Traps will vary from simple cul-de-sacs so the druid can snipe to fire-and-forget magical hazards like Spike Growth, Spike Stones, and Snare.