Aura in Black Hole / Yellow Sun
One of the themes in my fanfic is that all the physics are consistent and fairly realistic. With more fantastical elements like aura I try to design a framework for how they consistently operate.
Aura is a warping effect on reality caused by any sapient intelligence. Lots of people consider it to be the soul but it's not exactly the same as the philosophical concept. Aura projectors focus this effect into a shield that reduces damage to your body and equipment.
Aura projectors are a device about the size of a smartphone that plugs into an implanted port on the back of your neck. They were designed by Ozpin as a mechanical emulation of an organ his species had naturally. Fully implanted aura projectors exist (Raven has one) but aren't common because installing one is much more invasive and they're difficult to replace if they break.
Aura doesn't block damage completely. Strong attacks and most bullets will cause bruises. Armor piercing bullets and certain Semblances (Adam) can bypass aura completely.
Aura loss from attacks depends on where you're hit. Your bones are strong and can absorb some of the damage without draining much aura. Your organs are squishy and suck up a ton of it.
When your aura breaks you're stunned with an intensity dependent on the strength of the attack that broke it. Powerful attacks can render a person unconscious, trickle effects like electricity, fire, or Semblance use don't cause a stun at all.
Mechanical devices (usually spaceships) can be plugged into to project one's aura across them. The projected aura is fairly thin but still effective since it's protecting solid metal which is already extremely damage resistant. if multiple people plug into one ship, their auras act like a patchwork rather than a mixture. A single hit will only drain whoever's aura happened to be on that location.
You can't plug into another person to transfer your aura to them unless Jaune is part of the chain because his Semblance lets him do this exact thing.
