Human Fusion Spell

The Human Fusion Spell (commenly known as the Fusion Spell) is a magical technique that merges two souls into one. The one the spell is being used on's body starts to turn into powder and their soul begins to merge into the spellcaster's soul. It is one of the most powerful magic spells in The Sorcerer's Apprentice.

The only conjurors who are sucessfully skilled at practicing this enchantment are the two Merlineans, Balthazar Blake and Veronica Gorloisen.

This spell is used by Veronica to save Balthazar from the evil Morgana le Fay, who, centuries later, was destroyed by the Prime Merlinean and her plan of unleashing the spirits of many dead evil spellcasters via the sinister ceremony known as The Rising was foiled.

Process and Usage
To use the spell, a sorcerer starts by concentrating their magic while point their hands toward their target, and then point themselves as seen when both Balthazar and Veronica uses this spell. After this, the target will have their soul extracted from their body and enters the caster's. At the same time, the target's body also absorbed as well, though the process would reduced it into ethereal dust, as when Morgana exits Balthazar's body, she ended up became ghostly form of her former self.

It seemed that judging from how Morgana's soul possessed Veronica and then Balthazar for a brief of time after using the Fusion Spell, shows that extracted soul was not merged into the caster's, but rather possibly sealed within that body as a containment vessel. This was supported by the fact that Balthazar able to extract Morgana's soul without extract Veronica's, which also shows that when using the spell, the caster instead point both his/her spirit and their target's soul. Not only that, the extracted spirit will threaten to possess the caster once they inside their body.

If one's soul whom extracted by the Fusion Spell breaks free from the caster's body, as seen when Morgana came out from Balthazar's, they inevitably became a ghostly form of their former self prior to affected by the Fusion Spell, consisted as mass of dust that forms what has left of their body. In this form, they presumably invulnerable with physical attack, only weak against magical ones. However, they can avoid any magical attack by simply dissolve themselves. But if attacked by magic that they weak against by surprise however, they will be staggered, making them vulnerable. If they are attacked by barrage of magical attacks such as Plasma Bolts, they will dissolve into nothing and dies, as their non-corporeal body extinguished.

As Morgana le Fay is the only known magic caster that killed in this method, it is unknown whether alternate methods exist.