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Other than his conversation with Arusha , he cannot be spoken to.
During the quest, as you approach him and his companions, you'll hear them discussing Gulug:
- Karina : "Gulug's scent! It's almost enough to make this one want to stop dealing with him."
- Arusha : "Arusha would agree, except for all the gold he gave us. He's got the luck of Jone and Jode, even if he smells like a dead horker!"
- Karina : "This one hopes we are blessed with half his luck and twice his gold—but not his scent!"