Also known as: フォーミュラモード
The barrier jacket of Takamachi Nanoha used from Mahou Shoujo Lyrical Nanoha Reflection to Detonation.
The modification of Fortress Mode, and use with Formula Cannon that upgrade from Strike Cannon.
Can compare the differences between with Fortress Mode here:
Post #4351045 : Fortress Mode
Post #4351046 : Formula Mode