She waited a while longer before looking behind her, eyes narrowing in the direction she came. Briefly her eyes flashed along with her horn, and the ground itself broke apart, the raw earth pulling skyward until it reached the roof above her head. Another few words and the rock cracked and churned, changing shape with the sound of grinding stone. Satisfied at the false wall she had created, she changed course toward her underlings, safe in the knowledge that anypony coming behind her would run into a dead end, and would sooner try other avenues of investigation rather than spend too long lingering there.