There is a hole in the quest chain. the quest chain does not send you on to the next dwarf NPC. you have to do some searching but he is in one of the orc camps. see if my memory serves me.
soon as you leave the outpost and head up over the bridge then up the stairs you'll pass through two large stone monuments of dwarfs at this point you go down some stairs. you can either go left forward or right. ( going forward i believe there is a bridge.) head to the right and down some stairs, head down the long hallway you will come to A orc camp the entrance has 2 wooden walls on either side and a passage that you can enter. head in and straight back to the back of the camp.
there is a dwarf in there that is surrounded by dead orc's you talk to him to continue the quest chain.