Orcs

"A folk devised [...] to make war on Elves and Men [...]"


 * ― Note, The Fall of Gondolin

Orcs were a tribal úvanimo race from Utumna that spread to other territories in Middle-earth. A confederation of disparate groups scattered throughout regions, the Orcs wage war on Elves and Men to bring about the dominion of darkness.

History
Orcs were humanoid-shaped beasts and monsters bred from earthly slime made by Morgoth in unrecorded times of the elder days. As the main agents of Morgoth, and later Sauron, orcs formed the dark armies that assailed the lands of Elves and Men, toiling for the triumph of their masters.

Orc-bands roamed the wilderland and forests of Middle-earth, ever on the lookout for unfortunate travellers that came to closer to their camps. They were loathsome, merciless and miserable creatures that hated themselves as well as their cruel masters.