Character Change: Specter to SARU

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I'm afraid that's not really going to cut it. While you're free to roleplay the move as being weaker in certain areas if you so desire, a move being stronger/weaker due to environmental factors isn't an acceptable way to balance a move. Also, like I said, you're going to need to be more specific when it comes to the move's distance and area of effect.

If you need help with making a better move description and the move examples in the rules aren't helpful enough, I highly recommend using the Move Creation Workshop. Ed/Minato is always eager to help people with their moves.