coup de main - noun
kü-də-ˈmaⁿ
Definition of coup de main : an attack that achieves complete surprise.

Roshutsu Playing Game Final Nijiirononiji __full__ -

The Achromat saw itself—a void that consumed all light. But a void cannot consume its own reflection. The paradox hit like a logic bomb. The Achromat shuddered, its form flickering. The seven trapped colors on the floating islands began to pulse.

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