In the maps left of the Guild PQ map there are:
Ghost Stump
Wooden Mask
Stone Mask
These are great exp for lower level (I am thinking between level 25 - 35, but I am not sure.)
In the maps right of the Guild PQ map there are:
Skeleton Dog
Mummy Dog
Skeleton Soldier
Skeleton Officer (range attack)
Skeleton Commander (posion mist attack)
These are great exp for clerics/priests. All of them are "heal-able." However since I am not a cleric, I can be wrong. :D