Answer:
I cut through evil like a double edged sword, and chaos flees at my approach. Balance I single-handedly upraise, through battles fought with heart and mind, instead of with my gaze.
My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole I’m best when I am roast.
Talks like this, a green wise man does. Guess my clue, you will.
Take one out and scratch my head I am now black but once was red.
I climb higher when hot, But beware my rage, I’ll kill with a breath, If I can escape my cage
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.