Assuming that the focus limitation carries "non-persistent" as part of it, then fine.
I'd also wonder just how you would incorporate "Attack must be perceived" into this. As it stands... as long as the ninja has their sword in hand, even invisible sniper bullets have to hit a +5 DCV, which doesn't see right. A further -1/4 limitation, "Attack must be perceived" would be fine.
I'm also assuming that you are playing some variation of "multiple attacks in a segment/phase/round" get pluses to hit. i.e. Five agents all attack at once. First one is base OCV... second one is OCV +1, third one is OCV +2, etc. That means that on the sixth attack, the "Sword DCV" is effectively countered... but that makes sense, as the ninja is deflecting multiple incoming attacks.
I've got no problem with this.
Levels of RPG Development
(With special thanks to Zornwil)
Axioms: The sacrosanct core assumptions of the game.
Mechanics: The basic functional building blocks derived from the axioms.
Game Rules: The specific and variable application of Mechanics that define the play of the game.
Play Experience: The resulting behaviors of play and shared imaginary event unique to each group.
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