Cost: One Rouse check

System: After 1 turn of concentration inside a building you get a complete sense the layout and inhabitants at that moment. You know where each room is, whether there are secret passages or hidden chambers, and so forth. Your senses extend a maximum of three stories up and three stories down from the floor you currently occupy. You also learn the locations and approximate number of non-supernaturally concealed inhabitants.Duration: Until you leave the building