Spoiler: Examples showShe can fully mend a large, broken bone (femur, etc.) for 80%. Hemorrhages, due to the rather localized nature of blood vessels, can be healed quite easily - 10% in extreme cases. Muscle tears are rather exhausting, a large muscle group necessitating about 40%. Nerves, due to their very local nature, can be healed for less than 5%, in most cases. The most extreme thing she can pull off, however, is that if someone's had a limb sliced clean off, she can reattach it over the course of 3 days, starting with barely reattaching the bone along with repairing nerves and blood vessels and sealing the skin.
For the material, I believe it's the best thing to penetrate armour because of its supreme hardness, along with a weight to add some driving force. With a kinetic augment, that arrow should be able to easily punch through Goliath armour. And no, no more Aura damage than a normal arrow, wasn't planning on that either.