Who is Lepidopterist? Edit
It's usually a person who collects moths or butterflies :)
In season 3 AM's spot Lepidopterist in a real scene with the EMs, although it's not a trauma sequence, it's just Booey with the Lepidopterist mask on.
Lepidopterist is the trauma of dissonance.
She has a beautiful, soothing singing voice, but is also violent and abusive.
She is most commonly seen wearing the cobra mask.