On podcast 47 Kinak indicated more to find with this item, "about 40%". The last line of the description seems significant:
And hiding your true strength will always catch foes off-guard. Hell, if you get good enough at it, you might catch yourself off-guard as well.
Can we fight ourselves? Something mirror-related? Crypto suggested maybe masking our highest base stat as our lowest?
EDIT: The item description truly did come true and caught me off guard; Crypodynamic had to point it put to me.