- "Armor Ninjitsu Art of Rust Mist" cannot be activated during the Damage Step. If it is already active, its effect can be activated during the Damage Step.
- Even if you do not control a "Ninja" monster at resolution, the effect that halves ATK is still applied.
- The ATK of the monsters remains halved even if "Armor Ninjitsu Art of Rust Mist" is no longer on the field.
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