Immune to Aons During the Reod

 The results were encouraging, but many Aons failed completely. Any Aon, for instance, that targeted either of them flashed away ineffectually. Their clothing was a valid target, but their flesh was not: Raoden broke off the tip of his thumbnail and tried to make that float, and was completely unsuccessful. The only theory Raoden could offer was the one he had expressed earlier. 'Our bodies are frozen in the middle of being changed, Galladon,' he explained. watching a sheet of paper hover in front of him, then burst into flames. Linked Aons appeared to work. 'The Shaod hasn't finished with us-whatever's keeping the Aons from reaching their full potential is also stopping us from becoming true Elantrians. Until our transformation is finished, it appears that no Aons can affect us.'

Elantris Chapter 19