The shadow in the mirror grew teeth. It wasn't a demon, but a —a mass of negative energy his own skepticism and grief had accidentally nourished. He had to use the Table-Tipping technique in reverse, using his own physical weight to "ground" the energy. The Closing of the Veil
Unlike the mass-market copies, this one was bound in and filled with handwritten marginalia in a shorthand Elias recognized as his grandfather’s. The Unintended Invitation Buckland's Book of Spirit Communications
He slammed his palms onto his heavy oak workbench, visualizing a connecting him to the earth, just as the book instructed for mediumistic grounding . He shouted the closing affirmation: "The circle is broken, the guest is departed, the house is mine." The shadow in the mirror grew teeth