A Nei which allows its user to mimic another Caster's Nei and use it as if it was his or her own. This form of Nei appears to be quite peculiar and extremely rare.
The specific mechanics behind Mimic are as of yet unknown;
it's unconfirmed what the user has to do in order to copy other's Nei or how many types of Nei he or she can have at his disposal at a given time.
Nei Phase is a form of Concealment and/or Containment power which allows the user to hide peoples and objects, and prevent them from being sensed.
It's containment aspect allows the user to trap people inside the hidden Object or location using runes, preventing them from escaping it in any ways.
People in it can see people outside, however, they cannot be heard or seen.