After the War of the Last Alliance Mordor was desolate and the surviving Orcs were concentrated in the Misty Mountains. With the return of Sauron to Dol Guldur and the spread of his evil influence, their numbers began to increase once more. In TA 2475 at the ending of the Watchful Peace, a new tougher, stronger breed of Orc appeared; the Black Uruks, specifically bred for fighting Men.
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