One hit hurts a lot. Shoot ghosts, do not run into them. Grunts Grunts will run up to you and hit you with their clubs. Either move toward them to fight them hand to hand or shoot them. Demons Demons will try to shoot you with fireballs if they can and when they get close to you they will bite you as well.
Fireballs hurt more than biting does.
Either move towards them to fight them hand to hand or shoot them. Lobbers Lobbers will try to lob rocks over the maze walls and other objects to hit you. They will also run away when you get too close to them. Try to shoot them or trap them in a corner and fight them hand to hand. Sorcerors Sorcerors try to fool you by disappearing whilst moving.