Damon is still under Sybil's control and his main focus is to kill his brother Stefan. "The Vampire Diaries" Season 8 promo shows that Damon also intended to kill Bonnie, Caroline, Alaric and all of his friends at the Mystic Falls.
Reports added that Caroline and Bonnie had a nice talk regarding Bonnie and Enzo's relationship, while Enzo has same situation with Damon as well in "The Vampire Diaries" Season 8 GamenGuide relayed, that Damon almost kidnapped Caroline during her wedding. Gladly, together with her future maid of honor, they know how to break down a vampire.
More about "The Vampire Diaries" Season 8, as it talks about a deeper talk between Stefan and Sybil, as she told him about her long-lost sinister sister Seline. She told Stefan that her sister was actually the bad one and not her, she admitted that she was using her powers for good while Seline is doing the bad way.
Meanwhile, TV Guide revealed that Seline's true identity will soon be exposed. Seline being the nanny of Alaric and Caroline's twins is actually terrifying being satan's cannibalistic servant. Her plan involves the twins but is taking it the different way, as she is also a supportive nanny.
As the source goes on Seline is good in keeping secrets things secretly. She was very interested with the twins because they were incredibly powerful twins. The twin reminded her of her life with Sybil, and the difference is the twins were cared for by the parents while they have been an outcast in "The Vampire Diaries" Season 8.