Following the trend from my post yesterday, here's a rule i think would be very characterful for dryads/branchwraiths. This very thing is mentioned in their army entry, so i figured lets wishlist a rule!
Fey Allure: Dryads are feral creatures of raw primal fury, but often use their alluring illusions to tempt foes away from their companions where they become easy prey
After deployment but before the rolls for first turn, each dryad unit on the table may select a single core unit in the opposing players deployment zone. That unit becomes enchanted by them. The enchantment is dispelled immediately if any wood elf unit attacks the enchanted unit. On the enchanted unit's first turn, the unit must take a leadership test on 3d6 or sacrifice all other actions to march (not charge) their full distance directly towards the unit that has enchanted them. This includes marching through difficult and dangerous terrain. Even skirmishers cannot shoot after this march, although any wizards may cast spells as normal. Any unit with magic resistance OR a hero or Lord takes the leadership test on 2d6. Units immune to psychology are not affected.
Fey Seduction: (Branchwraith only) If dryads are masters of allure, then branchwraiths are experts. They seduce and slay the mightiest of generals and the most powerful of wizards
As Fey allure, except the branchwraith chooses one hero or lord and any mounts or units with the chosen hero or lord to take the leadership test on 3d6. Please note that if a branchwraith is fielded with a unit of dryads, she gets this separate ability, meaning two enemy units might lose their first turn to marching directly towards the dryad unit.