Dorian’s skin was pasty and gleamed with sweat. “This is how he did it, isn’t it?” Chaol nodded. “Ten years ago, with those three towers. They were all built years before so that this could happen precisely when his invading forces were ready, so no one could strike back. Your father’s spell must be far more complex, to have frozen magic entirely, but on a basic level, this is probably similar to what occurred.”
