Grashûkh was an Orc from Mount Gundabad who served Sauron in Dol Guldur. Like his remote ancestor Grashûkh of Dol Guldur, Grashûkh served as the Keeper of the Dungeons and enjoyed to torture prisoners. After the Battle of Moria, Grashûkh was recently injured after his fight with the dwarf Dwálin. He managed to recover from his injuries and returned to Dol Guldur where he was given an important task by his master. His job was to torture Thráin and find any information regarding his map and the key.