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Machina, Rem, and Sice in l'Cie Mode.

Turning Class Zero into l'Cie.

l'Cie Mode is a bonus gameplay mode in Final Fantasy Type-0. In this mode, any member of Class Zero can be chosen to become a l'Cie before a mission, excluding RTS missions. The chosen member is enhanced by a reddish aura that doubles all damage dealt, halves damage taken, and passively regenerates MP and AG over time. The damage effects stack with buffs.

To unlock l'Cie Mode, the player must clear every mission on "Finis" difficulty; this includes the main scenario, Code Crimson, and Expert Trial missions. The player can turn l'Cie Mode on or off for each character in the Armament menu by pressing left or right button on the d-pad.

Spoiler warning: Plot and/or ending details follow. (Skip section)

During Machina's Struggle, Machina enters compulsory l'Cie Mode because of him becoming a White Tiger l'Cie in his preceding storyline. Furthermore, he is the only member of Class Zero who keeps his White Tiger l'Cie appearance when entered l'Cie Mode in other missions, while the others receive their appearance accustomed to the Vermilion Bird.

Spoilers end here.