Wanderer's Staff of Rest

This simple staff appears to be of Elven
origin. Once per day as a bonus action, the wielder may say Nunce Requiem to create the illusion of a large, hollow Elm tree around
the user. The interior is 10 x 10 and the illusion lasts for 8 hours.
Perception vs 15 to be noticed, then Investigation vs 15 to be noticed.