Robe of Rubble Location
From Wyvern Source
Start at the goblin fort on the world map. North east of Minath and south west of Stoneybrook
Go north
Take the path west.
Go down the stairs to the sewers
Go through the sewers and up the stairs
Go north
Go north east twice
Go north
Go west (east is the goblin workboss' shield
Kill the lich
Pick up the dirty robe, this is the Robe of Rubble