Shocking revelations and mysteries surrounding 'The Vampire Diaries' season 6 characters were featured in the last episode entitled 'Black Hole Sun'.

Monstrous eye-openers finally shed light as to why Damon and Bonnie were sent back to 1994.

In the episode, it was revealed that when Damon was in Mystic Falls, he was with his brother, Zach, who he had not seen for over five decades. The former tricked the latter into believing that he was on an "all animal" diet. However, Zach discovered bite marks on his pregnant wife, Gail's, wrists.

Damon did everything to satisfy his needs, including throwing out all the "vervain," a potent herb that exposes vampire's weakness in feeding.

Stefan blasted in anger and blamed Damon for "ruining his life once more." Because of this, Damon turned into a beast that made him lose his mind. He eventually killed everyone in the party, including Gail, and fled the town.

Stefan made Zach forget everything and joined his brother into leaving town.

The massacre created by Damon happened during an eclipse that was supposed to be their chance at expelling Ky, the person Bonnie and Damon thought would help them get back to the present.

With destiny being as devious as ever, it turned out that Ky slaughtered his entire family, the Gemini Coven, and that Bonnie and Damon have no choice but to bring a murderous individual with them back to the present, since Ky is threatening to get their powers if they refuse to do so.