If we have a Potion Master, one of Berocka or Devise is probably Coven. We haven't seen any attacks yet, so they've probably used an Investigative and Healing potion on N1 and N2 (if they do exist). We could also have a Hex Master. But based off of the Spy results, I think its one or the other.
I don't think we have a Poisoner as no one has claimed to be poisoned yet. Good chance we have a Necromancer, we haven't seen anything from them because no one has died.
And it's confirmed at this point that we have a Medusa. So in my opinion, I think the Coven has:
Coven Leader
Hex Master OR Potion Master (we may find out tomorrow)
Medusa
Necromancer
Another thing that jumps out to me is that @Berocka was visited by Coven on N1 and N2. It wouldn't make sense for any of these roles to visit him twice, unless he was controlled on N1 and then was Hexed or had an Investigative Potion thrown on him. If this is true, then something went wrong in the Coven's plans to control Berocka into the Medusa and they felt the need to Hex/Potion him. Just a little suspicion.
now time for someone to come and debunk all of this