A spell that affected anyone in the area, that kept them from realizing they were sensing the vampires, was much less magic intensive than an actual barrier of the type the Gray Lords of the fae had placed around the Walla Walla reservation. Anyone who ventured into the area wouldn’t sense vampires, wouldn’t pay attention to anything the witch who set the spell didn’t want them to notice. Passersby probably saw the battered apartment building—they just didn’t notice it. I’d heard about witchcraft spells like this.
