Skeletons and Zombies are far less dangerous than most of the undead of Gloriana, typically they are simple mindless reanimated dead bodies.
"Animated skeletons, although rather disconcerting, are seldom a real threat to a seasoned adventurer. Assuming, of course, that the adventurer has more in his skull than the skeleton.
The Zombie is an animated corpse that shambles along trailing bits of decomposed flesh and extremities. Disgusting and extremely smelly, they are difficult to kill, being already dead. The Zombies' annual convention is known as a Jamboree." (Excerpt from the QfG1 Manual).
Skeletons and Zombies are monsters that can be seen in Quest for Glory I: So You Want to be a Hero?