Diablo is Maleficent's pet raven and magic familiar, frequently appearing alongside his mistress in the villain tournaments, where he is only rarely seen on his own.
He first appeared in the Disney animated film Sleeping Beauty.
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Pre War: The Dark Council
Diablo appears in the early events of the war, along with her mistress, when she senses the threat of Chernabog and his brothers, and calls the most powerful wizards of the world to form the Dark Council, a faction which could prevent Chernabog's rise in the mortal universe. However, he didn't get featured in the final battle on Bald Mountain.
Cameo Appearances
Diablo's role, during the events of the first war, was not much efficient, appearing only in several occasions, along with his mistress. He had made his appearance during Maleficent's vistit at Russia, threating the young Czar prince, Ivan, and his royal advisor, Ludmilla, who plot to take the throne of Russia by taking out both Ivan and Maleficent. Another cameo of the raven was at the palace of Egypt, the Horned King's recent base of operations, after the pharaoh Rameses, lost his battle with the Lich King. Later, Diablo appears in the Palace of Justice in France, along with the dark fairy. Maleficent approaches Frollo for a powefull alliance, after the Horned King's defeat, which the judge agreed to that offer since he wants more powerfull allies against his enemies.
The Battle In Egypt
Diablo plays a more significant role in the events of the war. He leads Maleficent's goons to the battle against the Lizardmen and the Egyptian Army, after Rameses and Rothbart managed to take out Maleficent's second in command ally, Lady Tremaine, Diablo, leaves quickly Egypt, only to be turned into stone by Rothbart's magic, much to Maleficnet's horror.
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Diablo in the Universe CGI
Return
Diablo has a greater symbolic role in the second war, as his resurrection is the primary test of Jafar's new genie powers. Later, Maleficent and Diablo welcomes the sea-wtich, Ursula to their faction.
Celebration And New Enemies
Diablo was presented in the Forbidden Mountains, when Jafar eliminate the world's leader and most hateful enemy of Maleficent, Ruber. However, after Evil Lyn invades her castle, Maleficent took Diablo to the Snake Mountains, where the evil lord, Skeletor, Evil Lyn's master, was residing in. Maleficent warned the skeleton warrior to attack her domain again, only to leave a furious Maleficent, when she encounters one of her previous allies, Lady Tremaine, in the services of Skeletor, explaining that the noblewoman was abandoned by the dark in the first war. Not only that but Skeletor resources from Lady Tremaine made his final decision to attack Maleficent's domain. Maleficent then left the castle preparing her forces for the upcoming battle.
The Battle Oof The Forbidden Mountains
Diablo plays a minor role in the final events of the second war, leading again the goons to the fight against Skeletor forces. He has no more footage afterwards.
Diablo (as Diaval) in the Universe Live-Action
Diablo's (aka Diaval's) Human Form in the Universe Live-Action
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A Quick Defeat
After witnessing the supposed death of Hades by the voodoo sorcerer, Doctor Facilier, and the fall of Queen Grimhilde at the hands of the noblewoman, Lady Tremaine, he rustled quickly to the Forbidden Mountains to warn Maleficent about the war's recent events. Unfortunately he was noticed by the noblewoman and before he can deliver his message to his mistress, Lady Tramaine turned him into a stone statue, much to Maleficent's dismay and rage when she met him outside of her chamber.
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Resurrection Into New Levels
After the rise of Chernabog and his dark minions, the Black God spread his evil in every of the Animated Universe.
Diablo's (aka Diaval's) Dragon Form in the Universe Live-Action
Unfortunately one part of the Great Evil released Diablo from his stone prison, ready to follow his mistress's commands again. However he learned that Maleficent had previously defeated in the Underworld, leaving only her dark cape in that area. Taking the cape to his advantage, he travelled in one of theportals, whom the Great Evil has opened during the final events of the war, to the Multiverse. There he dropped the cape, learning that if one person who previously died in his own dimension and transfered to another dimension, his dark memories will ressurect him in his previously state. That happens with Maleficent, who awakes in another universe and think a way about conquering it.
Transformed into Raven, during the final events of Disney Vs Marvel Villains War - Part Two
Afterwards
Diablo has not a major role after these events. He was last seen with his mistress, in the Animated Universe, when she rejects Hades's help after she learned his betrayal with Mirage, when Maleficent travelled to Grimhilde's castle and cured her from Doctor Facilier's Friends influence and when Maleficent introduces to the Evil Queen her own forces.
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Diablo's transformation into Raven Gargoyle, during the final events of the second war of Disney Vs Marvel Villains
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Diablo leads the the battle front of Maleficent's army against the barbarian forces of the Horned King. Unfortunately, the Horned King overpowers the monsters and turns Diablo to stone. His defeat is avenged by Maleficent, who moments later witness his fate.
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Spying Frollo
At the Palace of Justice, Frollo decided he had had enough of Maleficent's interference in his plans to bring "justice" to the resistance, vowing that he would see her burn in Hell for her sorcery. However, he was unaware that Diablo was listening to his rants.
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Bringing Maleficent's robe
Arriving in the CG universe, Pete met up with Diablo, who was bearing his mistress Maleficent's robes.
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Spying for Maleficent
Magneto heard stories about Maleficent and believe those stories are fake. Unfortunately, Maleficent's bird heard that and reveals that to Maleficent. Angrily, The Mistress of all Evil attack his lair and making a spell into killing Magneto.