[MultiWonder]

(DISCLAIMER: This was tested on the Test Server.  I thankfully caught this before trying anything funny on main Dx)

Upgrading a standard yin / yang into their guilded variants does not carry over regalias.
Interestingly, it still marks it at 'Customized and Pristine', when in truth, you can't apply any attack animations to it nor does it wield any re-dos.