Olog-hai

"These he (Sauron) called Olog-hai, and they where great beasts with the reasoning intelligence of evil men."

- David day, "Guide to Tolkien's World: a Beastiary" (words in Parentheses Mine)

Toward the end of Middle Earth's third age, Sauron the Dark Lord sought to create a new race of Trolls, one which had human intelligence and wickedness rivaling that of the orcs. Taking some trolls, he bred the Olog-Hai, the ultimate shock troops of Mordor. These agile warriors, though intelligence, kept the bestial savage natures of their less intelligent trolls ancestors, and proved themselves formidable at the Battles of the Pelennor Fields and Morannon/Black Gate. These armored warriors where said to have become mindless, dumb brutes when Sauron's ring was destroyed, proving easy pickings to King Aragorn's army at the end of the battle of the Black Gate. But could any evil that Sauron wrought die so easily? Could it ever really dissappear, even in the age of men?