Natural Aura

Description
Natural Aura is and has always been a form of energy that surrounds the user in a medium shade of gray. This aura of energy can only be seen/sensed by those that have trained in and have entered Sage Mode, to not be a walking beacon of Natural Energy in non combative situations. As such, only those that have trained in Sage Mode can use this, with those capable of Shizenjutsu to use it outside of Sage Mode.

Usage
These are the current list of plain (Natural Energy only) techniques for the Natural Aura:
 * Natural Armor
 * Natural Bubble
 * Natural Shell

List of techniques when one adds an element to one's Aura:
 * Lightning Release: Shell of Radiance
 * Fire Release: Molten Skin

Improving off of Sage Art: Inorganic Reincarnation
 * Nature's Transmutation is a substitute for Elemental Sage Mode, without the obvious 3x multiplier outside of Sage Mode.

Trivia

 * Alone, the Natural Aura is pretty useless as it doesn't offer any sort of offensive or defensive buff. But it is something that will always surround those that has trained in it.
 * Seeing as how it was fully realized by Jay Nara, he's claiming it and nobody can use it or any of the techniques it's associated with, without his expressed approval.