Complete the sub-quest, Prove Ye Be a Swabber!, from Grak Liversplat( 1059,123,701 ) within Brokenskull Loft. To reach Grak, go back to the place you found the sokokar tags, and then cross the bridges to reach the entrance to the cave. Follow the cave until it forks, and turn left toward the hanging lanterns. Once you're standing below them, turn to the right and follow the tunnel upward. You'll know you've found the correct tunnel when you pass piles of gold coins.