Servant. When your whole hook is “eerie and mysterious”, you need to provide some payoff for the viewer at some point. After 4 seasons we got some really underwhelming payoff, and by that point the show had gotten so stale that Leanne was actually getting significant amount of dialogue, so we also find out that that girl isn’t a great actor. Thank god the production value was so high in other ways, because the narrative itself became very cheap.