Aura is an ability that all those with a soul can use, at least with enough practice. Because Aura is the manifestation of the soul, it can appear very differently depending on who is using it. For example, the color of Aura is different from person to person. Also, a person with a strong Aura may radiate bright colors when using it.
Aura can be used in a variety of ways, having been known to enhance attacks, increase defense, heal injuries, and even unlock the aura of others.
Now then, there are going to be quite a few ways you can choose to use it. I know that it seems mighty restrictive but Aura is just too vague at the moment. These are your options:
Might - This is your strength value. This determines how much you can lift and how far you can lift it. For example, one Aura point can lift one kilogram up one meter.
Salvation - This is your healing value. This determines how much you could heal by. Smaller amounts heal minor damage while high consumption can heal larger ones. For example, using one Aura point can heal a scratch on your hand while using fifty can heal a gash across the chest - not without a scar, however.
Tank - This is your defense value. This determines how much you can reduce attack damage by.