The Dor'Danil Barrow Den, traditionally a place of rest for druids, is a small area near Splintertree Post in Ashenvale. Although the incursion of the Horde put the Barrow Den behind enemy lines, it is still an Alliance refuge for these druids.
While the orcs of the Horde had virtually zero interest in the sleepers, the Forsaken were far different in their ideas. They delved into the ideas of severing the spirits of the sleeping druids, managing to drive them completely insane with their experiments. As a result, this den is now home to Forsaken assassins, enraged souls of the druids and three spirits - Uthil Mooncall, Mavoris Cloudsbreak, and Taneel Darkwood.