<P> Damon is disturbed to learn when he gets to Lily that she has been trapped with other vampires and they allowed her to drink their portions of blood to stay alive . She is reluctant to leave without them, but Damon threatens to leave her behind if she doesn't go . Bonnie, Damon, and Elena leave with Lily, leaving Kai behind . When they return, Bonnie gives Damon a gift she'd gotten for him during her trip to Nova Scotia in the 1994 Prison World: the cure to vampirism . He struggles with whether or not to give it to Elena and provide her with the life she'd been robbed of . </P> <P> After using Lily to get Stefan's humanity back and he is used to bring Caroline back, Lily is adamant about returning to her Prison World to retrieve what she considers to be her family . Damon confronts Bonnie, who had taken the Ascendant, and tells her that Lily is threatening to destroy the cure if he doesn't return with the means to get her "family" back . However, when he decides to let Bonnie destroy the Ascendant, he comes home to find that Lily had actually given the cure to Elena instead . He confesses that he was selfish and afraid of losing her but agrees that she should take it and that he'll take it with her . </P> <P> Elena takes the cure and, unexpectedly, her memories return and she remembers when she'd traveled to Nova Scotia with Damon in search of the cure the first time, he'd told her that he used to miss being human, but, now, he couldn't imagine anything more miserable . She tells him he needs to think about it before making that decision and enlists Stefan to try to make sure Damon is certain of his choice to become human . Damon almost decides he'd rather stay a vampire until he witnesses an interaction between an older couple . Before Jo and Ric's wedding, he tells Elena he'd made his choice to live one lifetime with her . During the wedding, Kai shows up and stabs Jo before causing an explosion . The second to last episode ends with Elena lying unconscious on the ground . </P> <P> In the last episode of the 6th season titled "I'm Thinking Of You All The While" Damon rushes Elena to the hospital after vampire blood fails to heal and awaken her . At the hospital the doctors tell him that she is medically healthy and they see no reason why she's not awake . Kai stumbles into the hospital injured . After consuming Lily's blood and killing himself, Kai's ability to siphon magic allowed him to become another Heretic (vampire with witch - like power), but he was soon bitten by a transforming Tyler, who had re-triggered his werewolf curse . Kai tells Damon and he's linked Elena's life to Bonnie's and as long as Bonnie lives, Elena will remain asleep but perfectly healthy . He also tells him that the spell is permanent and any attempt to find a loophole in the spell will result in the death of both Bonnie and Elena . Damon returns to the wedding to find Bonnie badly injured on the floor and Kai's reminder that letting Bonnie die will allow Elena to regain consciousness . Damon tells Bonnie he's sorry and leaves the room . Kai is irritated that his plan to torture Damon with an impossible choice had failed and, while he's distracted, Damon decapitates him from behind . Damon saves Bonnie's life and they go to the Salvatore boarding house to say their goodbyes to Elena, deciding that they will allow Bonnie to live her life and, when she dies, Elena will wake . Damon allows himself to enter Elena's subconscious to say his goodbye, dancing with her and telling her that he'll never be ready to live the next 60 years of his life without her . Stefan and Damon move the coffin holding Elena to a crypt and have Bonnie seal the door magically to keep away those seeking the Cure . </P>

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