- "YES... LET THIS NEXT ATTACK BE OUR LAST. MY DOOM WEAPON SCREAMS TO UNLEASH ITS FULL POWER!"
- — Sepulchure during the battle with King Alteon
- "I AM DARKNESS! I AM DOOM..... NO FORCE ON THIS WORLD CAN DESTROY WHAT I AM! LONG UNLIVE THE SHADOWSCYTHE!!!!!!'"
- — Sepulchure's quotes before collapsing.
Sepulchure is the cursed DoomKnight and leader of the evil Shadowscythe, the main organization that represents evil within AdventureQuest Worlds. Once, he was King Alteon's greatest Knight... and while we do not know what terrible events transpired, we do know that Sepulchure is no longer human. It is said that now, only Darkness is his master. Sepulchure commands every major villain along with his unstoppable force of undead abominations to rid the world of the living and engulf our world in the void of endless darkness. Sepulchure kept the existence of his daughter secret, so no one outside his giant undead flying fortress knew about her.
He and King Alteon have a deep hatred, that seems to stem from a long and treacherous past, as he was one of the king's best and most trusted knights before he became corrupted by the Doom weapons. It was also said that Sepulchure blamed King Alteon for what happened to Queen Lynaria Alteon (who secretly helped Sepulchure to father Gravelyn). During Friday the 13th he decided to end the war that had plagued the forces of good and evil by surrounding the city of Swordhaven. He fought his way to the king's throne room with his loyal minion Chuckles to finally confront the king and end the war. He and the king fought but both seemed evenly matched. As each side was ready to deliver the other a finishing blow, a winged figure descended and interrupted. The figure revealed himself to be Drakath, an old underling of his. Drakath then raised his sword and defeated Sepulchure and King Alteon, covering them in chaos. Sepulchure conversed with Drakath about the unlikelihood of his defeat at Drakath's hands, and was then killed by the once ally. His armor collapsed and what little that remained of him erupted into the sky. Drakath heard Gravelyn's cry from the flying fortress above and shot it down, where it then crashed into the side of a mountain.
It is later revealed that Sepulchure was taught about necromancy by Noxus who created Sepulchure's army.
When Gravelyn is later captured by Chaos Vordred and Sally claims the Noxus Head Staff as Noxus orders Chaos Vordred to kill the heroes Gravelyn's last words were her wishing that her father was here. The tomb of Queen Lynaria Alteon grants her wish and revives Sepulchure. When Noxus orders Chaos Vordred to stand down, Chaos Vordred goes on the attack only to be easily destroyed by Sepulchure as Sally and Noxus bow before Sepulchure. Gravelyn detects that the Sepulchure present isn't the real Sepulchure. The tomb of Queen Lynaria Alteon states that Sepulchure was killed by Drakath where there is no coming back from death. Drakath ends up warping reality to make it look like the Sepulchure has returned from the dead.
AdventureQuest Worlds: Zombies
In the alternate timeline caused by Drakath, the players come in during the battle between King Alteon and Sepulchure to warn them about Drakath. When Drakath doesn't show up, Sepulchure takes the opportunity to attack the player only for King Alteon to take the hit. Sepulchure's Doom Blade states that King Alteon isn't the Champion of Light as the Champion of Light's death is needed to open the portal to the Plane of Darkness. When Death arrives to claim King Alteon's soul, he states to Sepulchure that he will come for him one day. Sepulchure retaliates by killing Death causing the recently departed to return as Zombies that obey Sepulchure's every command. The players escape from the palace as Noxus, Dage the Evil, and Nulgath join Zombie King Alteon into bowing before him. Sepulchure doesn't find his daughter in his fortress as the Doom Blade states that she is the true Champion of Light (which explained why Gravelyn isn't undead like her father and how she lit up enough to hurt a Ghoul). This causes Sepulchure to prepare his flying fortress to go storm Battleon and target his own daughter.
Sepulchure shows up to challenge Gravelyn as an army of Angry Zombies and Zombie Dragons attack. As the battle rages on, the players and Artix try to stop Sepulchure as Sepulchure tries to get Artix to use his darkness powers. Sepulchure manages to do an attack on Artix and then blasts the players into Yulgar's Inn where they end up fighting Cyzerombie, Zombie Alina, Zombie Galanoth, Zombie Warlic, and Zombie Rolith. After defeating Zombie King Alteon, the players see Sepulchure about to deal the final blow to Gravelyn. Sepulchure finds himself unable to kill his own daughter. Just then, Drakath appears and strikes at Gravelyn only for Sepulchure to take the hit. Gravelyn unleashes her full light powers to drive away Drakath. The Doom Blade then takes control of Sepulchure's body transforming it into Dark Sepulchure in order to finish the job. The players end up fighting Dark Sepulchure and managed to defeat him. Artix tells the players that a shadow creature can only be slain by the Blinding Light of Destiny as Dark Sepulchure gets up behind them. Gravelyn leaves her fight with Drakath and grabs the Doom Blade which she purifies into a weapon that destroys Dark Sepulchure and restores reality back to normal.
- In the Evil quest Chaorrupted, it is shown that his armor has been corrupted by chaos and is being controlled by it, and so the player must defeat his Chaorrupted Armor in order to finish the quest.
The name "Sepulchure" sprouts from the word "sepulchre" which is a burial chamber.