An attribute with a numeric value will work, since those resolve before scripts. If you're asking if you can use a roll (for instance, to do a calculation), the quickest way to know is to try it. I'd be surprised if it doesn't do roll-value extraction, but if it doesn't you can add ZeroFrame to your game and extract any roll value just by adding .value to the end of the inline brackets: [[2d20kh1]].value