The Great Conflict

You continue shooting at the ceiling and soon it gives way, large chunks of stone, plaster and wood falling on top of the cleric. His green aura fades and he lays, buried in debris, knocked out but alive. You can see the evening sky peeking through the large hole in the ceiling. You pull the cleric's body out of the rubble and zap him with your pistol to make sure he is fully incapacitated.

+1 Prisoner

You then continue into the hallway, only needing three more prisoners to reach your objective.