Doppleganger's Cowl

While worn with its hood up, you can use an
action at will to polymorph into a small or
mediumhumanoid you have seen.(Your stats,
other than your size, are the same in each form.)
Any equipment you are wearing or carrying isn't
transformed. You revert to original form if you
are unconscious or if you use an action to do so.
A creature familiar with the humanoid you have
polymorphed into can discover that you're an
imposter with a DC 16 Intelligence
(Investigation) check.