His “weapon” was his appearance itself, a walking creature with other ruin human body parts that made him up. On the contrary of similarities, like everything else, these monsters portrayed characteristics that differed them from each other such as the fact that Frankenstein was horrid on the outside but very soft and emotional on the inside. He defiantly knew what it felt like to be talked down on and feel the pain from it. Grendel was not very emotional, he carried himself to be very strong and uplifting in himself. Despite their differences, Grendel and Frankenstein are both similar in the way that they were both greatly feared by their surrounding people.