"How did the Fae even get in here? I am certain that I didn't detect them when I cast the barrier, and nobody has broken it." Petros grumbled as news of his plan was rapidly distorted as the Faerie's description spread through the city.
Wolfe shrugged. "I am not certain either. I have asked many times how they evade sentry spells, and move through barriers as if they weren't there, but the answer is always just that they're Faeries.
I do have a theory, though. Faerie dust is so magical that it can cause epiphanies among the witches, so it is possible that the barriers detect the dust coating and think that they're just mana moving through. Normally, a barrier spell wouldn't even try to stop mana from moving through, as it's necessary to all things.
But I am also not cruel enough to trap a Faerie in an Antimagic barrier because if I'm right, it might actually kill them."