Go to Menos. In the Inn, speak with Toma (the man standing in the upper-right corner on the first floor) three times. He will recount how, long ago, he stole the Black Mask - the Dudbears' treasure. Now that he is sick, he wants to make up for his crime. He will ask you to take the mask back to the Dudbears'. Tell him yes and you will receive the Black Mask. Return to the Menos Inn and speak to Toma once more. He will tell you that he was miraculously cured. QUEST CLEAR!