The Vampire Diaries
The Vampire DiariesFacebook/The Vampire Diaries

Stefan's hesitation to spell out his feelings to Caroline before her mother's funeral is one of the contributing factors for Caroline to turn off her humanity switch. And, in the next episode, the gang will struggle to limit the destruction that Caroline causes as she sets out to enjoy being a vampire in all its glory.

But one person who will be deeply affected by Caroline's change will be Stefan, who feels partially responsible for her acting out after her mother's death. As "The Vampire Diaries" fans know, Sheriff Forbes asked Stefan to take care of Caroline, and Stefan might take the blame for Caroline switching off her humanity.

Elaborating on what's in store for Stefan when the series returns on Thursday after a brief hiatus, director of the upcoming episode, Ian Somerhalder, told Entertainment Weekly that the younger Salvatore brother will go through an intense transformation.

"Stefan makes a very, very tough decision that changes everything for him for quite a while," teased Somerhalder. When asked if this would involve Stefan shutting off his humanity switch, Somerhalder played coy, and said: "Stefan goes through a pretty intense transformation."

In other "The Vampire Diaries" news, showrunner Julie Plec revealed that she has already penned season 6 finale, and said it's a tearjerker. "This weekend @carolinedries and I wrote the final scenes of #tvd season 6. I can guarantee you have no idea what's coming," Julie tweeted.

As Plec mentioned tears, fans believe death of yet another character is a strong possibility. In this season alone, fans had to deal with the loss of two characters – Luke and Sheriff Forbes – and the latter's death scene was one of the most heartbreaking scenes of "TVD" till date. However, that wouldn't stop showrunners from putting more characters on the chopping block, and if the series has taught us anything, it's that no one is safe.

But before the finale, fans will get to know more about Enzo's backstory and why he is the way he is; whether Stefan and Damon's mother is indeed evil and the reason for locking her up in the prison world; and how bad Caroline can get, now that she has turned off her humanity switch.

"The Vampire Diaries" airs Thursdays on the CW.