Ring of Seeing

(Requires Attunement)
You can use an action to see into and through
solid matter for 1 minute. This vision has a radius
of 30 ft. The vision can penetrate 1 foot of stone,
1 inch of common metal, or up to 3 feet of wood
or dirt. Thicker substances block the vision, as
does a thin sheet of lead.
Whenever you use the ring again before taking a
long rest, you must succeed on a DC 15
Constitution saving throw or gain one level of
exhaustion.