In the Wizard Tower.
A figure invisible to the naked eye was slowly advancing, and no one knew how the figure snuck into the tower. It was not until he reached the second floor at the bottom of the tower that Gloria noticed the intruder. The figure moved cautiously along the corner; no one would underestimate the power of the Wizard Tower and its various traps. No one knew how many dangerous devices would be installed in the tower by the Wizards who were distraught.
"Eeek!"
There was a slight noise and the invisible figure prized open a door. The figure walked through it carefully.