Regalis Piece (You may only have one Regalis Piece in your deck, and use it a total of one time in a fight)

If your vanguard's grade is less than your opponent's vanguard's grade, this ability can be played while ignoring grade.
Choose a unit being attacked, and it gets [Power]+15000 until end of that battle. Choose one of your opponent's units, until end of turn, it gets [Power]-5000, and if your opponent persona rode this turn, it gets [Power]-10000 instead of -5000.