Jude is the instigator of the Spring War, which in turn led to the events of all Witch Spring games. While he only plays a major role in Witch Spring 1 and Witch Spring 2, he makes cameos in the third and fourth games.
In Vavelia[]
For 800 years, Jude served as Lord Aramute's secretary. Feeling that he wasn't being properly rewarded for his efforts, though, he hatched a plot to take Aramute's role and powers for himself. He informed a man named Celvis, a wise and kind leader among the humans, of (what he thought was) the secret of the Springs. The two started the Spring War and founded a new religion with Celvis as its Pope, while Jude went under the guise of Vavelia's strongest warrior, Crown, and was an active participant in killing the Temple Lords.
Ten years later, Jude remains disguised as Crown when Pieberry and Luna's stories begin. He first encounters Pieberry during her visit to Elysion Temple, where he fights her. After he injures her, Black Joe steps in and is temporarily returned to his original Nuuk form after Jude hits him. With his power restored, Black Joe knocks off Jude's helmet, revealing his deity form to Pieberry. He lies about his disguise and motives for attacking her, and convinces her that he was working undercover to undermine the Pope.
While Luna sees him a handful of times during the course of the game, he doesn't notice her until she encounters him in Durok Temple. He attacks her, though she overpowers him after a battle. Having sensed Aramute's power in him, however, she mistakes him for Aramute himself. Jude takes advantage of this, convincing her to train hard and gather more magic power for him before they infiltrate the Pope's Castle. After they get in, however, Jude tricks her into standing in a magic circle that sucks out her magical power, leaving her helpless. She awakens in a jail cell, though she is able to escape via a small opening in the cell's wall.
Meanwhile, Pieberry makes her way to Durok Temple and restores his Spring. However, before she can open the chest in his temple, she is ambushed by warriors dispatched by Jude and is knocked unconscious. She, too, is locked up in prison. Jude sets her free and goads her into confronting the Pope in the middle of a ceremony to both eliminate the Pope and set her up as the "evil witch." His plan nearly works, but he is defeated by Pieberry (first game) or a tag-team of Pieberry and Luna (second game). Afterwards, the dark magic stones he consumed for the sake of gaining power force him back into his true form as an Ancient Dragon.
Breaking out of the palace, he terrorizes Vavelia Village before being intercepted. In the first game, only Temar and the reawakened Temple Lords appear. In the second, depending on the friendships Luna forms, the Nuuks, Sofia with long-range artillery, the dwarves and their cannons, Red Beard, and Ludina will all come to the village's aid. Ultimately, Aramute erases Jude's existence after informing him that all he had done had been according to the Temple Lords' plan.
In Derkarr[]
Witch Spring 3 sheds some more light on Jude's past.
Long before the start of the story, he was an Ancient Dragon and the son of the King of Ancient Dragons. Like the rest of his kind, he was beheld to the Dragon's Nest for immortality. However, he was unlinked from the Nest after becoming Aramute's Secretary and receiving a deity's power. No longer fearing repercussions if he tampered with the Nest, he conspired to use the Ancient Dragons to help him instigate the Spring War.
Jude stole the Nest and gave it to Regal, claiming the Dragon's Nest had the power to heal the frail and sickly Esther. In reality, the Nest was absorbing her vitality and would soon worsen her condition, but Jude placed his own magic over it so it would appear to have the effects he claimed. Regal agreed to take the Nest, and decided to aid in the Spring War if it meant keeping Shubeth Village secure on a dying continent.
Upon realizing Jude had stolen the Nest, the Ancient Dragons flew to Shubeth to recover it. The co-conspirators already anticipated this, and called upon the aid of Vavelia's deities, who sent Temar, Vavelia's strongest guardian animal. With Temar away, Jude was able to slay the Temple Lords and start the Spring War on Vavelia. Meanwhile, the Ancient Dragons found that Jude had tied the Dragon's Nest to Regal's life. If Regal died, so would the Dragon's Nest—but Regal would not be affected if the Dragon's Nest was destroyed. Thus, the Ancient Dragons could do little but assist him to ensure the Nest's safety.
Towards the end of Chapter 4: Tri-Caliber (Dark Path, True route), Luna and Pieberry travel to Derkarr to announce the Pope and Jude's deaths, and to expose their evils to the neighboring continent. With Jude dead, the magic binding the Dragon's Nest to Regal also disappeared. Once Monnet realizes that the two Vavelian deities spoke the truth, she enacts her revenge on Regal, fatally poisoning and leaving him to die.
In Monnet's post-game event, it turns out that Jude was also Monnet's father, conceiving her with a human woman some time after becoming Aramute's Secretary. This is why Monnet has a human form and has a tiny hint of a deity's powers within her.
In Ürphea[]
As in Vavelia and Derkarr, Jude and Celvis instigated the Spring War on Ürphea. When the leader of Rubid Village opposed the Spring War and attempted to protect a certain deity that lived in it, he and most of his family save for his only daughter were slain and the village was severely punished.
When several Warriors corner the Rubid Village deity after slaying her parents, Jude (as Crown) and Celvis teleport in front of her after sensing a large amount of power from her. With a single glance, Jude realizes Agamo's power emanating from her is dangerous, and warns the surrounding Warriors to leave immediately before teleporting away.
Following that incident, neither Jude nor Celvis returned to Ürphea before their deaths. However, illusory versions of them can be fought at the Path of Illusion.