Morgul stalkers are an advanced breed of orc created by the Witch-King and are used as either a unit for Mordor or for Angmar.
Morgul stalkers are one of the main breed of orc that attacked Osgiliath. They have the power to melt into the background, so during the battle of Minas Tirith they where able to get into the city before they broke down the main gate. They were bred in Carn Dûm by the witch-king and again in Minas Morgul they approach unseen and unheard and slit others throats...friend or foe.
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