Goblins and white Uruk-hai pledged to Rûkhor the Pale Herald threaten the expedition into Cirith Ungol.
'These white Uruks must be the Bloodless, as Rûkhor called them. We would do well to defeat as many as we can now, while we have the element of surprise on our side. I believe that Rûkhor uses the goblins as fodder for empowering his Uruk-hai forces, making them a strategic target as well. Enter Kaslokroz and defeat as many of Rûkhor's forces as you can.'
Rûkhor's forces are camped in Kaslokroz in Cirith Ungol.
You should defeat Rûkhor's uruks and goblins.
Legolas can be found near Kaslokroz, Rûkhor's encampment.
You should talk to Legolas.