Board Thread:General Discussion/@comment-68.193.154.25-20130908050757/@comment-198.1.0.221-20130917040217

the aura is said to a person's essence or soul born outward as a force. This would make it unique to each individual person, with some powers (strength, speed, durability, etc) being common and others being based on the person themselves. This is also like the cause of the Ruby's rose petals apearing when she vanishes. Since Weiss can see them we know they exist in the show and are not just artistic. It also apears that any blood Ruby spills when fighting Grimm's gets turned into rose petals. As you mentioned Yang appears to be able to set herself on fire and gain even more strength when channeling her Aura. So it is definatly based on each person and their fighting styles. Weapons channeling Aura would also explain Crimson Rose's effect of creating rose petals. It would definatly have it's limits, but as for what they are we will see. Perhaps stronger Aura's have more power, or can just protect more. Only time will tell.