Balrog

Balrogs are Maiar spirits seduced by Morgoth, giving them massive demon like bodies with fiery rocklike skin and horns. They have the ability to control both fire and shadow, wielding a fire whip. They can also shroud themselves in darkness and shadow. Their fire is internally part of them and they stand eighteen feet tall with a tail extended back the same length. Despite having fiery wings, Balrogs cannot fly. They usually live in dark damp and dangerous areas. The Balrog of Morgoth is the most feared living Balrog, but it was defeated by Gandalf in the Mines of Moria on the Bridge of Khazad-dum.