Nightmare Vine
Nightmare Vine requires a herbalist to be level 365 to gather and can be found widely throughout Shadowmoon Valley, Blade’s Edge Mountain and near Throne of Kil’jaeden in Hellfire Peninsula. They seem to spawn in more areas than before, you will be able to find them in open plain or even hidden away behind rocks. Beware, it is known that the gatherer may get stung by the herb during gathering, and cause them 75 – 125 nature damage for 10 seconds.
See below for maps to farm Nightmare Vine and be careful of the toxic debuff.