Board Thread:General Discussion/@comment-39492511-20190807174432/@comment-39854843-20190817043543

Blackchaos27 wrote: Just throwing this out there, but wasn't it stated that Grimm cannot generate an aura because they don't have a soul? I don't remember that. Do you have any idea what volume it was in?

It's not really relevant though, because we don't know that Penny's aura is the same as everyone elses. Penny's aura may not require a soul.