The crab monster is missing a leg because it is greedy for power. The crab monster covered with gold, silver and jewels symbolizes greed for power, money and narcissism. Those who do whatever it takes to achieve their goals have been pursuing shiny things all their lives and decorating themselves resplendent. In order to satisfy himself and even hurt his family, he ate his grandmother. There is a scene in which the golden light shining on the crab monster attracts the fish into the trap and becomes its free lunch, just like those people who are confused by power and money in society, throwing themselves at each other regardless of danger.