When desperation drives a man to feast on his own, he must be banished. The cannibals live a pityful existence on the fringes of their old steadings, banding together only to hunt. Instinct: to feast on raw meat

• Stalk the stragglers
• Pretend to be a friend
• "Looks like meat's back on the menu!" - call for help

They exist in primitive societies in the underground mazes. Their ancestors may have been prisoners or trapped miners. But now they are twisted cannibals with wiry frames and crazed eyes, and reeking mouths full of rotten teeth, stained with the dried blood and flesh of their victims. Instinct: to feast on human flesh

• Use fingernails like scalpels
• Stage a distraction or lay a trap
• Transmit cannibal fever
• Shriek for reinforcements