Aura was once a young adventurous fox who was taken in captivity with his sister, Tara, to witness the perfection of Lypherex, eventually he died, the sorrow spread throughout the room, for about 5 seconds, Metal Sonic, feeling the moral needed to rise, resurrected him with the power of Chaos, which is what inspired Tara to learn it.
Later life[]
After his resurrection and defeat of Lypherex, he left to find a way to the other side, or the afterlife as some call it.