To use aura in combat you must follow these steps.
1. Learn to control the aura of your own body
2. Learn to control others aura
3. Learn what your aura element is
Dark : A pure offence styled element
Light : A element devoted to defence
Fire : A element that uses offence and speed
Ice: A speedy element that is quick striking
Earth: A element that uses defence and raw power
Wind: A fast and defensive element
4. Develop your own tecnique
notanerd1
What about water? that would probably be a quick defensive one.
auronwolfman
I only listed the one I know about, but yes it would be a quick defensive element