Actually, that vine thing idea does intrigue me. Kind of like a Venis fly trap concept, or other carnivorous plants. Imagine having like 200 orcs walking through a field only for all of them to be dragged to the ground and killed by blood-sucking needle-covered vines. Of course, there would have to be easy counters for things like this - the trick would be using them when a player is not prepared and checking for them. Then you could do lots of damage.
"Yes... I am writing a book. So far I have the page numbers." - unknown author.