Hira's diamond aura gives her immunity to all empathic and mental abilities, but also strengthens when she is in her diamond form, or when she is scared or frightened. The aura also strengthens her diamond shield, giving it the same properties. She had no idea of its existence until others remarked that they couldn't read her mind or mimic her abilities. It's not known if this aura can ever be taken away from her or controlled. It can be seen through abilities which can see various auras, and can be identified thus.