LoTRO Lord of the Rings Online Rogmul

An ancient and powerful creature, the Rogmul sprang from the same dark depths where the Balrogs were awakened. They are beings trapped between Middle Earth and the realm of the Unseen. Enslaved to the Balrogs, Rogmul are among those creatures that the people of Middle Earth wish they could undercover, set back to sleep deep below the surface of the earth. Being both shade and flesh, any evil less powerful than the balrog would bend a knee in servitude or flee in fear.