Ring of Luminescence

Once per day, you can turn into a floating ball of
light for 1 minute. While in this form, you can
move at normal speed and can pass through glass
and other translucent or transparent objects. You
can also pass through any tiny spaces light could
penetrate, such as under doors or through prison
bars. You cannot communicate, cast spells, or
take any action other than the move action while
transformed.