Juggernaut
"Several small wagon trains have recently been overrun by a force of goblins and wolves while the former were camped out at night. Among the attackers was a titanic black beast on which some of the goblins rode, a monster so huge that it crushed whole wagons beneath its feet and flung horses and riders aside with its arms." --from the adventure.
Includes an extensive narrative opening to the adventure and a map of the cave system.