Balrogs

Spirits of flame and shadow, most fearsome monsters after the Dragons. They were Maiar who were seduced by Melkor.

Their chief weapon was a many thonged whip of fire, as well as swords, axes and maces.

Balrogs killed Feanor early in the War of the Silmarils. Most Balrogs were slain and Beleriand was destroyed. Some hid under the roots of Mountains. One such was disturbed by the deep mining of the Dwarves. It destroyed Moria and Killed Durin.