Berserker is a creature from a Clive Barker movie called Nightbreed. They are uncontrollable creatures that are kept locked up and only used for emergencies. Pretty cool beasties considering you see them for less than five minutes. The drool was created by gluing fising line to the mouth and then dribbling 5-minute epoxy down the line. Some off-white paint was mixed into the glue to give it some color.