“You are inspired by the revelations of Thelume. You can detect hidden things, and see through illusions.”― In-game text
A Scroll of Detection works very similarly to Thelume's Wisdom Level 1. But the Scroll of Detection is used up after a single use. Both the Scroll of Detection and Thelume's Wisdom are magical versions of the ability to detect secrets due to high Awareness and/or Dungeoneering skills and/or armor with the Detection attribute.