Melkor was the most powerful of the Ainur, but turned to darkness and became Morgoth, the definitive antagonist of Arda from whom all evil in the world of Middle-earth ultimately stems.
Melkor oli võimsaim ainudest, kuid pöördus Pimeduse poolele ja temast sai Morgoth, Arda põhiline antagonist, kellest kogu Keskmaa kurjus tuleb.