Ch.15 pg.8. Because demonfolk are aware of the spell's existence and have the magical ability to do so, they ward their private spaces. I'm sure that after this party, there'll be a lot of interest in learning how to apply those wards in the human realms.true, though in all fairness, it was also said that you can ward an area to prevent this form being used
Gotta love the expressions on page 1.