I was killing Ulthorks up on the north shore when a line of Ry'Gorr came by.. 2 then 1 then 2.. I pulled the one in the middle and killed it easily with my fire pet. Conned blue to a 35 Mage.
Mystyre Malkaw`Esh of Solusek Ro Queen of Fire, of the 35th conjuration
I have killed quite a few of these guys near the orc fort. Always seem them in a group of 5 or so. Never have dropped any loot. They are always walking toward the fort entrance. I believe they spawn along with Commander Bahreck and some other giants as part of the 7th ring quest. If not killed they seem to walk to fort and despawn several times until killed.