From SuspireWiki

An Adhvaryu is a member of the Chorus that has, in some way or another, proven themselves worthy of the Circle of the Crone. The Adhavaryu is given a place serving the Hierophant during rituals typically acting as the Acolyte who performs the ritual. This is an often abused position, however, as the Hierophant can and has decided to use the Adhvaryu as a personal assistant of sorts.

Advarayu can also be known as Abjurant, Apprentice or Victimarius.