In the distant past, Thirsty Spell was a unicorn with great ability and knowledge of magic. During his youth, he solved these problems with these powerful powers and was elevated to the rank of Hero. With Star Swirl the Bearder, Theye thus became magicians of the royal court of Canterlot and advisers to the king. However, Thirsty Spell, still curious about witchcraft, was learning how dark magic works, but dark witchcraft could fulfill her deepest desires, Thirsty Spell, thinking it was a myth, could not resist his attraction, and studied the darker magic. In addition, he manipulates Luna to have someone who protects him in case there is a problem, thankfully, Star Swirl will warn the king of the actions of his colleague, arrested as a traitor In the kingdom, Thirsty Spell will have arguments that he did this in order to have knowledge in case of danger even if it was for evil, the king removed his horn as a punishment for his crimes and was banished for treason.
Wandering alone in distant lands, Thirsty Spell was looking for a way for this avenged Equestria, until the day he was going too far inland, he found himself on the land of a diabolical being called Nothingness, eager for revenge for his then banishment, for Thirsty Spell had the opportunity planned on destroying the Equestria royalty. He sold his soul to the otherworldly forces of darkness from Nothingness in exchange for his Reliquary in the form of a horn and for the power to destroy the King and his family and return to the services of Nothingness during her practices, so that he is all possible and known evil powers. With that, Thirsty Spell completely sank in the corruption and will found the clan of the “Maleficents”, a band of ponies, unicorns and pegasus fighting for Nothingness, with in front of this armed WrathKanon. But it will not stop there, indeed, it will create creatures and evil spells, they will have for many serious consequences and direct on the world, like the disappearance of king and the queen of Equestria, the ascencion of the King Sombra, the creation of the pony of shadows or the transformation of Luna into a Nightmare Moon.
He aims to create with Grogar the alicorns soldiers of great power thanks to the soul of mystical creatures for many years. Yet nothing is going as planned, since one of them had escaped. Later, he will return in front of Equestria’s army by opening a door for his master to participate in the battle, but following this failure, Thirsty Spell disappeared. He will find refuge in the limb because he lost the relic that gave him all his power, but despite the defeat against Equestria 2 years ago he is still as dangerous and determined as before. But while everything is going well for them for the Maleficents, the stars where Celestia and Mane 6 were imprisoned are about to give way, for him, the time has come to get out and get back to work right away before losing the edge.
Star Swirl the Bearded describes Thirsty Spell as having a similar personality to Pinkie Pie. Flashbacks in the issue depict him as being eccentric and carefree, like Pinkie Pie. Like Twilight, he is shown to have a deep passion for magic and learning and a thirst for knowledge, as well as being very adventurous. Know he was seen as a very manipulative, diabolical, arrogant and wicked unicorn, to the point of killing the entire family without any remorse. He is the type of unicorn who is capable of giving everything to fulfill their promises, bequeathing to the point of selling his soul to dark forces just to have the power to destroy. He is also seen to be somewhat reckless, obsessive, spontaneous and impulsive with his objectives when these are not achieved. He is a unicorn of crude and opprobrious nature, due that he constantly hits his assistant. His favorite weapon is a trident.