takamachi nanoha (formula mode)

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:
Danbooru post #4351045 : Fortress Mode
Danbooru post #4351046 : Formula Mode

This tag implicates takamachi_nanoha (learn more).