This mask changes its appearance to fit the wearer's true soul, but it is picky about who can wear it. 

+3 to Intimidation while wearing the mask, The Ability to speak with Tigers/Lions/Other felines while wearing the mask, +2 the wearer's max STR

While wearing the mask, it grants the wearer to assume the form of an Oni (Demon's Growth). As a free action, the user transforms into the form of a large demon with golden claws. You can cast the enlarge/reduce on yourself. Once you use this you cannot use it until after your next long rest. +10 movement and you can move at full speed while grappling instead of half speed. If you fail the save, you suffer from the effects of confusion until you are able to roll a success. If the wearer dies or goes unconscious in Oni form, you revert back to your true form.

Notes: Bonus: Intimidation, Bonus: Strength Score