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Heylin was a side composed of antagonists and villains. It was the arch-nemesis of the Xiaolin side and the source of much antagonism in the series. The main goal of the Heylin side was to conquer the world. To those ends, many on the Heylin side sought the Shen Gong Wu as well such as Wuya, thus putting them in frequent conflict with the Xiaolin.
Some on the Heylin side, however, didn't care about the Shen Gong Wu and instead chose to find ways to do evil without them (e.g. Chase Young and Hannibal Roy Bean). Sometimes, this even included turning members of the Xiaolin to the Dark Side (e.g. Raimundo and Omi).
In contrast to the Xiaolin, who combine elemental magic with their Martial arts, the Heylin side used a mixture of Martial arts and dark magic, such tricks include: turning people into animals, creating rock creatures and even the making of a special soup that turns the drinker evil.
Wuya - Heylin Witch
Hannibal Roy Bean - Heylin Demon
Chase Young - Heylin Warrior
Jack Spicer- Evil Boy Genius
Ying-Ying bird - Messenger
Mala Mala Jong - Demon Warrior
This particular rank in the Heylin is most likely to be the highest due to Wuya's almightly powers and the fact that it made her have an immunity to all Shen Gong Wu and Xiaolin Magic which is shown in the episode "Citerdel of Doom." Since Wuya is the only Heylin Witch mentioned or named in the series it is suggested that this rank is extremly difficult to rech and that Wuya was the first or that their is only one Heylin Witch at any given time as their is on imformation given about the Heylin before the first Xiaolin Showdown.
Heylin Demon / Warrior.
Not much is known about the Heylin Demons not a rank as such but if it was to be then it would probably be seconed in the ranks.Hannibal Bean was a notible Heylin Demon to which he was concidered to be one of the most dangerous evil begins in the universe.
This rank is very complex in some aspects a Heylin Warrior could infact triumph over a Heylin Demon for instance when Chase Young imprisened Hannibal in the Ying-Yang World. However in Chase Youngs case it is likely that he supassed this rank however it is not stated but it is implied as he showed particular mastery of magic to which stop Wuya from regaining her powers despite this it shows that contery to his skills the Heylin Witch would be more powerful then him if she regined her powers.