Quick and Easy Questions (please read the OP)

[Ebonywood Hellscythe]

If an element is already canon to the Omnvierse and has been used in a Plot Arc, is it off limits for moves? In this case, Dark Chips / Dark Cards, as it were? 

I'm asking because some of the things I have planned for the Omniverse with James Knight require such.

You cannot obtain an actual dark chip without doing Dark Data and getting one.

You can call your moves whatever you want, however. So if you wanna say some move is a Dark Card, you can do that. "Elements" are not disallowed, they just don't come with the perceived advantages (so water doesn't "beat" fire, etc.).