[WillowIX]

Well in the boogre prison spells tend to fizzle regardless of sorcery skill. It almost seems it is the level of the spell that matters. High level spells tend to fizzle more often for me inside the prison whereas most low level spells seem to work. Moiraine, try casting flamedrop and burning haze. That sould take care of them. Remember that they move slowly so you are able to hide behind a corner, run out and cast a spell, then retreat to safety once more.