Dungeons and Dragons (1983)

After another attempt at getting home is foiled by Venger, the frustration is too much for the kids. They decide to take the fight to Venger and finish things once and for all. Their idea: Tiamat - Venger's mortal enemy. When they disregard Dungeon Master's next mission to embark on their own, he advises against it and then indicates where they can find Tiamat. A place called the Dragon's Graveyard, where old dragons go to die. The kids then start their journey to the graveyard, but not without the presence of Venger in the midsts.