Arcadius

Arcadius, better known as Cade, was a recurring character and an antagonist in the eighth season of The Vampire Diaries. He was the world's first psychic who in death came to be known as the Devil and creator of Hell.

Early History
Arcadius was born in a village situated on an island in the Mediterranean. He was gifted with the ability to see into the minds of others as the world's very first psychic. He had used his powers to empathize and help others which led him to be loved by his fellow villagers. However, when he had used his powers to peer into a man's mind and saw his "impure" thoughts for a young woman in the village, he approached the man with an offer to help quell his "urges" using his gift. The man however was mortified and furious so instead he had turned the villagers against Arcadius. Together with a mob of villagers the man had Arcadius captured and burnt at the stake. In his final moments, Arcadius feeling anguish and betrayal at being unjustly murdered by the very people he helped, he let out a psychic blast, as he was set ablaze, that was so powerful that it created it's very own dimension which would come to be known as hell. Arcadius' soul resided in this new world of his and from then on he would collect the souls of the wicked who had died and feast on them.

After 750 B.CE
After his death, other people born with the same gift as him were persecuted and exiled to the island he once inhabited to die. At some point two psychics named Sybil and Seline lived on the island and unbeknownst to Sybil, Seline was tricking her into luring men to the shores of the Island with their powers, not for their cargo but the bodies of the men themselves which she used to feed them. When Sybil tried to commit suicide after learning of Seline's lies and cannibalism Arcadius approached them. He offered them eternal life provided that they feast on the flesh of mortals for eternity while he harvests the souls of their victims. Seline agreed on both of their behalves and the Sirens were born.

Season Five
In Gone Girl, Arcadius was not seen but is the reason behind Katherine Pierce's sentencing to Hell.

Season Eight
In An Eternity of Misery, Sybil reveals her backstory to Stefan while implying that this is what Arcadius wishes for her to do. She also reveals Cade's name and origins to Stefan. Through her flashbacks, Sybil informs Stefan that Cade was the world's first psychic. He was a kind man who used his powers to help his fellow villagers until one turned on him in fear, and rallied the village against him to burn him at the stake. In his dying moments, his anger at their betrayal caused him to unleash a psychic blast that created a new dimension that Cade's spirit controlled, a place that would be called Hell, where Cade punished the souls of the people who betrayed him as well as the souls of wicked people for eternity. Elsewhere as a bedtime story to Lizzie Saltzman and Josie Saltzman, Selinetells them the story of Arcadius. He also called forth Georgie's soul to hell when she was killed by Seline.

In Detoured On Some Random Backwoods Path to Hell, Cade is summoned by Seline in an attempt to bargain for her and Sybil's freedom. She offers the twin siphon girls Lizzie and Josie Saltzman as replacements for the Sirens. Cade tells Sybil he is intrigued by the offer before Sybil makes a counter offer. Sybil offers Cade the Salvatore brothers as the willing replacements for the Sirens as they are powerful vampires with bloody histories. Damon masterminded the deal and convinced Stefan to accept in order to spare Caroline and Alaric's twin girls. Sybil reveals she secretly altered the deal so Cade allowed her to still be an immortal Siren, but is no longer bound for Hell, while Seline must still go to Hell as revenge for leaving Sybil in the Vault centuries ago. Cade accepted Sybil's deal, and granted Stefan a day left of freedom before his deal activates.

In The Next Time I Hurt Somebody, It Could Be You,

In Nostalgia's a Bitch, Sybil and Seline are sitting in a diner arguing and trying to make amends, moments later Cade walks inside and expresses his disappointment over their constant bickering. Shocked to see him, Cade reveals that the bell was rang enough to give him an appearance on earth. The Sirens attempt to convince Cade they could manage to work together, but Cade decline their offer and killed both sisters, consumed in hellfire.