"We're not going to kill them! I already told you that!" the leader says, indignant, while the one who spoke up earlier. "R-really, you can speak with them. We've been quite kind, and established a good bargain with them. All we need is for them to use their spells to assist with out casting, and then they are free to return. We simply don't have enough spellcasters to manage the ritual, all at once," he explains. "There's not even a true circle, it's simply an accumulation of energy, directed over the city."