Would that harm your aura in any way?
Sounds like a good one though, as one of several, at least, The typical buy-you-time shield...
Another idea, though...what if, instead of stone, you picture coal, pressed together so hard that it turns to diamond? That way, it'll be not only harder, but able to blind/cut too?
You promised me the ending would be clear
You'd let me know when the time was now
Don't let me know when you're opening the door
Stab me in the dark, let me disappear