One thousand years ago, the wizard Rorek of Nol engaged the ancient dragon Malchior in battle. But the dragon proved to be physically superior to Rorek, so he decided to employ his very last resort and trapped Malchior inside his spellbook with a powerful curse. Through subsequent ages, the spellbook changed hands and eventually wound up in Raven's possession.
Upon first reading it, Raven was quite taken by the story of the battle; so much in fact that she completely isolated herself from her teammates just to read the story to its end. When she felt the most lonely, Malchior made his move, introducing himself as a kindred spirit who could empathize with Raven's nature. He slowly won Raven's trust and affection and manipulated her into freeing him from his physical imprisonment first, then he taught her his full knowledge of magic to enable his complete escape.
Raven succeeded in breaking the curse, but at the same time and to her horror came to realize what she had unleashed. When the Titans proved unable to take down Malchior in hand-to-hand combat, Raven used Rorek's curse to entrap Malchior in the spellbook once again and locked it away. Her sadness about his betrayal was soon alleviated by Beast Boy, who offered her a shoulder to cry on.
Some time later, Malchior was somehow freed and joined the Brotherhood of Evil in his paper form, though he could resume his dragon form at will. During the final confrontation with the Titans, he planned to incinerate Melvin, Timmy and Teether, but his vicious attack was stopped by Herald, whose horn opened a dimensional rift which sucked first Malchior's fireburst and then Malchior himself into another dimension.
POWERS AND ABILITIES
While trapped in Rorek's spellbook, Malchior's powers were severely limited. He could, however, reshape and remodel the book's pages and its contents at will, which greatly helped him in facilitating his escape.
In his humanoid paper form, Malchior could employ his magical powers to some further extent, enough to instruct Raven in their use and even imprint written knowledge directly into her mind.
In his true dragon form, Malchior possessed super strength and physical endurance and the power to fly. In addition to his physical weapons (teeth, claws, tail and fire breath), he also possessed a great amount of resistance to offensive attack forms, whether physical, energy, or magical. He could also communicate telepathically with others, if he ever bothered to do so.
In all three forms, Malchior possessed vast knowledge of dark magic and any lore about the arcane arts ever known to man.
Althrough the true depths of his personality has not been shown, some glimpses of it can be seen in the episodes he shows up in. One nature of his personality is sly cunning and dark humor, as shown when his dragon form was finally revealed and taunted Raven.
Malchior has also been shown to have a great skill at bewitching and tricking others, as shown on many occasions. One specific example of this is when he switched the names in the story from the book, from Rorek of Nol to Malchior of Nol. Also, to get Raven to help him, he changed the images of the book to suggest she was 'prophesized' to help and release him, as well made it look like he was an innocent victim.
Another more renown example of this is how he decieved Raven's own heart and emotions. Using her emotions of being alone and how 'no one understood her', he tricked her to rely more and more on his attention and teachings of dark magic, to further lead her to release him so she would 'never be alone'.
Under this whole sharade however, Malchior doesnt even have a shred of respect for humans. Known to kill just for the sake of killing, and hold those hostage just because he felt like it, Malchior finds toying with human life as a big game, Facinated with watching them squirm.