So, Esther is the 4th witch revived?
Sophie said in last episode that 4 witches were revived instead of the 4 girls sacrificed...
But we've only seen three of them so far: Papa Tunde, Bastiana, and Genevieve
Celeste wasn´t by any means revived, she's been "possesing" Sabine for about a year now...
Maybe in the end they all will need to kill Esther in order to bring Davina back..