There should be a link on the word "telepathic" that will give you a basic description of each thing Nagi can do and the weaknesses her ability has aside from the obeisance that I still can't figure out. The exceptions are the things that I believe would make Nagi too overpowered if I had kept them.
She has her scars for another reason. Uuuugh. I hate thinking about obeisances. :/