Most "zones" that spawn an "instance" dungeon for a quest replenish all SP, HP and strip all buffs and enhancements. However some, predominantly those from a wilderness area, do not. That is, they do not replenish SP/HP. They DO strip buffs which is a double whammy to the spell casters. Now I assume this is done to prevent level 20 buffage before entering a low level dungeon. But this is very unfair to casters who now have to manage SP for two zones and lose buffs they cast AND the SP they cast it with to make it through the parent zone. Simply fix the wilderness dungeons to replenish SP/HP on zone in.