Beast Soul (獣王の魂, ビーストソウル, Bīsuto Sōru) is a Take Over Spell.
Beast Soul allows the user to completely take over the appearance and abilities of a powerful, beastly creature known as “The Beast”, described by Mirajane as “the king of monsters”.  In such state, the user’s size increases exponentially, with their arms growing longer, larger and sprouting sharp claws, and they become covered in thick fur, with their abdominal and pectorals prominent in the middle. Their hair takes on a mane-like appearance, their ears and canine teeth become pointed, and they grow a pair of striped horns pointing upwards, starting from a plate on their forehead. The first time said spell was used by the user, the user's legs, much smaller in comparison to their large arms and torso, grew dark hooves, and they also gained a pair of protrusions sprouting from their shoulders, similar in appearance to their horns; when it was used again during the Fighting Festival arc, however, the user’s feet bore resemblance to a large bird’s, with dark claws, and the protrusions on his shoulder weren't visible anymore. In both forms, however, the only piece of the user’s attire which remains on are their pants, which get shorter as a result of their transformation, and sprout extremely prominent and spiky upper edges.
Enhanced Speed: Despite their larger size, the user’s speed is increased exponentially in such state, as shown when Elfman, a Mage capable of using this spell, charged at the agile Sol and rapidly defeated him with a barrage of fists while spinning rapidly on himself, without giving the opponent a single chance to react, whereas before he couldn't land a blow on him. The user can also rapidly move around by jumping, and climb on vertical surfaces through the use of their claws with great agility and speed.
Enhanced Strength: This form further boosts the user's already great physical might, so much that they are capable of releasing a person from the grip of Phantom Lord’s gigantic Super Mage Giant Phantom MK II without much trouble, and of stopping Belcusas the Thunderclap's enormous fist with a single arm.
Enhanced Smell: In this state, the user’s sense of smell is greatly increased, comparable to that of a beast's, as the user is capable of chasing an opponent around while blindfolded, increasing their advantages against Magic that needs to be seen in order for it to work.
|Mirajane's Spells||Satan Soul • Satan Soul: Sitri • Satan Soul: Halphas|
|Elfman's Spells||Beast Soul • Beast Soul: Weretiger • Beast Soul: Lizardman • Beast Soul: Belcusas • Beast Arm: Reptile • Beast Arm: Bear Arm • Beast Arm: Black Bull • Beast Arm: Iron Bull • Beast Arm: Jet Black Sword • Beast Arm: Stone Bull|
|Lisanna's Spells||Animal Soul: Bird • Animal Soul: Rabbit • Animal Soul: Fish • Animal Soul: Wings • Animal Soul: Half Bird • Animal Soul: Tigress • Animal Soul: Penguin • Animal Soul: Mermaid|
|Lisanna's Spells||Animal Soul: Armadillo • Animal Soul: Owl|